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, 53 insertions, 29 deletions

diff --git a/ports/libgd/CONTROL b/ports/libgd/CONTROL
deleted file mode 100644
index 81384cb06..000000000
--- a/ports/libgd/CONTROL
+++ /dev/null
@@ -1,29 +0,0 @@
-Source: libgd

-Version: 2.2.5-4

-Homepage: https://github.com/libgd/libgd

-Description: Open source code library for the dynamic creation of images by programmers.

-Default-Features: fontconfig, freetype, jpeg, png, tiff, webp

-

-Feature: fontconfig

-Description: Support for fontconfig

-Build-Depends: fontconfig

-

-Feature: freetype

-Description: Support for freetype

-Build-Depends: freetype

-

-Feature: jpeg

-Description: Support for jpeg

-Build-Depends: libjpeg-turbo

-

-Feature: png

-Description: Support for png

-Build-Depends: libpng

-

-Feature: tiff

-Description: Support for tiff

-Build-Depends: tiff

-

-Feature: webp

-Description: Support for webp

-Build-Depends: libwebp

diff --git a/ports/libgd/vcpkg.json b/ports/libgd/vcpkg.json
new file mode 100644
index 000000000..901a3eb62
--- /dev/null
+++ b/ports/libgd/vcpkg.json
@@ -0,0 +1,53 @@
+{
+  "name": "libgd",
+  "version-string": "2.2.5",
+  "port-version": 5,
+  "description": "Open source code library for the dynamic creation of images by programmers.",
+  "homepage": "https://github.com/libgd/libgd",
+  "default-features": [
+    "fontconfig",
+    "freetype",
+    "jpeg",
+    "png",
+    "tiff",
+    "webp"
+  ],
+  "features": {
+    "fontconfig": {
+      "description": "Support for fontconfig",
+      "dependencies": [
+        "fontconfig"
+      ]
+    },
+    "freetype": {
+      "description": "Support for freetype",
+      "dependencies": [
+        "freetype"
+      ]
+    },
+    "jpeg": {
+      "description": "Support for jpeg",
+      "dependencies": [
+        "libjpeg-turbo"
+      ]
+    },
+    "png": {
+      "description": "Support for png",
+      "dependencies": [
+        "libpng"
+      ]
+    },
+    "tiff": {
+      "description": "Support for tiff",
+      "dependencies": [
+        "tiff"
+      ]
+    },
+    "webp": {
+      "description": "Support for webp",
+      "dependencies": [
+        "libwebp"
+      ]
+    }
+  }
+}