Bulk convert control files. (#19986)

```
function Convert-Control {
    Param($full)
    .\vcpkg.exe format-manifest $full
    $root = $full.Substring(0, $full.Length - 7) # CONTROL
    $new = $root + 'vcpkg.json'
    $content = Get-Content -Raw $new
    $asJson = ConvertFrom-Json $content -AsHashtable -Depth 100
    $oldVersion = $asJson['port-version']
    if ($null -eq $oldVersion) {
        $oldVersionFull = $asJson['version-string']
        Write-Host "Got version $oldVersionFull"
        $match = [System.Text.RegularExpressions.Regex]::Match($oldVersionFull, '^(.+)-(\d+)$')
        if ($match.Success -and -not [System.Text.RegularExpressions.Regex]::IsMatch($oldVersionFull, '^\d\d\d\d-\d\d-\d\d$')) {
            $newFullVersion = [string]$match.Groups[1].Value
            $oldVersion = [int]$match.Groups[2].Value
            Write-Host "newFullVersion $newFullVersion oldVersion $oldVersion"
            $newVersion = $oldVersion + 1
            $asJson['version-string'] = $newFullVersion
            Write-Host "Previous version for $full extracted from version field -- setting version-string $newFullVersion and port-version $newVersion"
        } else {
            Write-Host "No previous version for $full -- setting 1"
            $newVersion = 1
        }
    } else {
        $newVersion = [int]$oldVersion + 1
        Write-Host "New version for $full : $newVersion"
    }

    $asJson['port-version'] = $newVersion

    $content = ConvertTo-Json $asJson -Depth 100
    Set-Content -Path $new -Value $content
    .\vcpkg.exe format-manifest $new
}

Get-ChildItem ports\CONTROL -Recurse | Foreach-Object {
    Convert-Control $_.FullName
}

git commit -am "this message"
.\vcpkg.exe x-add-version -all
git commit -a --amend
```

2 files changed, 145 insertions, 59 deletions

diff --git a/ports/libwebp/CONTROL b/ports/libwebp/CONTROL
deleted file mode 100644
index 2d9b2fd7d..000000000
--- a/ports/libwebp/CONTROL
+++ /dev/null
@@ -1,59 +0,0 @@
-Source: libwebp
-Version: 1.1.0
-Port-Version: 3
-Homepage: https://github.com/webmproject/libwebp
-Description: WebP codec: library to encode and decode images in WebP format
-Default-Features: simd, nearlossless
-Build-Depends: libwebp[unicode] (windows)
-
-Feature: anim
-Description: Build animation utilities.
-Build-Depends: libwebp[mux, img2webp]
-
-Feature: gif2webp
-Description: Build the gif2webp conversion tool.
-Build-Depends: giflib
-
-Feature: img2webp
-Description: Build the img2webp animation tool.
-Build-Depends: libjpeg-turbo, libpng, tiff
-
-Feature: vwebp
-Description: Build the vwebp viewer tool.
-Build-Depends: opengl, freeglut (!osx)
-
-Feature: vwebp-sdl
-Description: Build the vwebp viewer tool.
-Build-Depends: libwebp[vwebp], sdl1 (windows)
-
-Feature: info
-Description: Build the webpinfo command line tool.
-
-Feature: mux
-Description: Build the webpmux command line tool.
-
-Feature: extras
-Description: Build extras.
-Build-Depends: sdl1 (windows), libwebp[vwebp]
-
-Feature: nearlossless
-Description: Enable near-lossless encoding
-
-Feature: unicode
-Description: Build Unicode executables. (Adds definition UNICODE and _UNICODE)
-
-Feature: simd
-Description: Enable any SIMD optimization.
-
-Feature: cwebp
-Description: Build the cwebp command line tool.
-
-Feature: dwebp
-Description: Build the dwebp command line tool.
-
-Feature: swap16bitcsp
-Description: Enable byte swap for 16 bit colorspaces.
-
-Feature: all
-Description: enable all features except for swap16bitcsp
-Build-Depends: libwebp[anim, gif2webp, img2webp, info, mux, nearlossless, simd, cwebp, dwebp], libwebp[vwebp-sdl] (!osx), libwebp[extras] (!osx)
diff --git a/ports/libwebp/vcpkg.json b/ports/libwebp/vcpkg.json
new file mode 100644
index 000000000..1f1925216
--- /dev/null
+++ b/ports/libwebp/vcpkg.json
@@ -0,0 +1,145 @@
+{
+  "name": "libwebp",
+  "version-string": "1.1.0",
+  "port-version": 4,
+  "description": "WebP codec: library to encode and decode images in WebP format",
+  "homepage": "https://github.com/webmproject/libwebp",
+  "dependencies": [
+    {
+      "name": "libwebp",
+      "features": [
+        "unicode"
+      ],
+      "platform": "windows"
+    }
+  ],
+  "default-features": [
+    "nearlossless",
+    "simd"
+  ],
+  "features": {
+    "all": {
+      "description": "enable all features except for swap16bitcsp",
+      "dependencies": [
+        {
+          "name": "libwebp",
+          "features": [
+            "anim",
+            "cwebp",
+            "dwebp",
+            "gif2webp",
+            "img2webp",
+            "info",
+            "mux",
+            "nearlossless",
+            "simd"
+          ]
+        },
+        {
+          "name": "libwebp",
+          "features": [
+            "extras"
+          ],
+          "platform": "!osx"
+        },
+        {
+          "name": "libwebp",
+          "features": [
+            "vwebp-sdl"
+          ],
+          "platform": "!osx"
+        }
+      ]
+    },
+    "anim": {
+      "description": "Build animation utilities.",
+      "dependencies": [
+        {
+          "name": "libwebp",
+          "features": [
+            "img2webp",
+            "mux"
+          ]
+        }
+      ]
+    },
+    "cwebp": {
+      "description": "Build the cwebp command line tool."
+    },
+    "dwebp": {
+      "description": "Build the dwebp command line tool."
+    },
+    "extras": {
+      "description": "Build extras.",
+      "dependencies": [
+        {
+          "name": "libwebp",
+          "features": [
+            "vwebp"
+          ]
+        },
+        {
+          "name": "sdl1",
+          "platform": "windows"
+        }
+      ]
+    },
+    "gif2webp": {
+      "description": "Build the gif2webp conversion tool.",
+      "dependencies": [
+        "giflib"
+      ]
+    },
+    "img2webp": {
+      "description": "Build the img2webp animation tool.",
+      "dependencies": [
+        "libjpeg-turbo",
+        "libpng",
+        "tiff"
+      ]
+    },
+    "info": {
+      "description": "Build the webpinfo command line tool."
+    },
+    "mux": {
+      "description": "Build the webpmux command line tool."
+    },
+    "nearlossless": {
+      "description": "Enable near-lossless encoding"
+    },
+    "simd": {
+      "description": "Enable any SIMD optimization."
+    },
+    "swap16bitcsp": {
+      "description": "Enable byte swap for 16 bit colorspaces."
+    },
+    "unicode": {
+      "description": "Build Unicode executables. (Adds definition UNICODE and _UNICODE)"
+    },
+    "vwebp": {
+      "description": "Build the vwebp viewer tool.",
+      "dependencies": [
+        {
+          "name": "freeglut",
+          "platform": "!osx"
+        },
+        "opengl"
+      ]
+    },
+    "vwebp-sdl": {
+      "description": "Build the vwebp viewer tool.",
+      "dependencies": [
+        {
+          "name": "libwebp",
+          "features": [
+            "vwebp"
+          ]
+        },
+        {
+          "name": "sdl1",
+          "platform": "windows"
+        }
+      ]
+    }
+  }
+}