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, 41 insertions, 8 deletions

diff --git a/ports/azure-storage-cpp/CONTROL b/ports/azure-storage-cpp/CONTROL
deleted file mode 100644
index d8c772570..000000000
--- a/ports/azure-storage-cpp/CONTROL
+++ /dev/null
@@ -1,8 +0,0 @@
-Source: azure-storage-cpp
-Version: 7.5.0
-Port-Version: 1
-Build-Depends: cpprestsdk[core], atlmfc (windows), boost-log (!windows&!uwp), boost-locale (!windows&!uwp), libxml2 (!windows&!uwp), libuuid (!windows&!uwp&!osx), gettext (osx)
-Description: [legacy] Microsoft Azure Storage Client SDK for C++
-  A client library for working with Microsoft Azure storage services including blobs, files, tables, and queues. This client library enables working with the Microsoft Azure storage services which include the blob service for storing binary and text data, the file service for storing binary and text data, the table service for storing structured non-relational data, and the queue service for storing messages that may be accessed by a client.
-Homepage: https://blogs.msdn.com/b/windowsazurestorage/
-Supports: !uwp
diff --git a/ports/azure-storage-cpp/vcpkg.json b/ports/azure-storage-cpp/vcpkg.json
new file mode 100644
index 000000000..21180d49f
--- /dev/null
+++ b/ports/azure-storage-cpp/vcpkg.json
@@ -0,0 +1,41 @@
+{
+  "name": "azure-storage-cpp",
+  "version-string": "7.5.0",
+  "port-version": 2,
+  "description": [
+    "[legacy] Microsoft Azure Storage Client SDK for C++",
+    "A client library for working with Microsoft Azure storage services including blobs, files, tables, and queues. This client library enables working with the Microsoft Azure storage services which include the blob service for storing binary and text data, the file service for storing binary and text data, the table service for storing structured non-relational data, and the queue service for storing messages that may be accessed by a client."
+  ],
+  "homepage": "https://blogs.msdn.com/b/windowsazurestorage/",
+  "supports": "!uwp",
+  "dependencies": [
+    {
+      "name": "atlmfc",
+      "platform": "windows"
+    },
+    {
+      "name": "boost-locale",
+      "platform": "!windows & !uwp"
+    },
+    {
+      "name": "boost-log",
+      "platform": "!windows & !uwp"
+    },
+    {
+      "name": "cpprestsdk",
+      "default-features": false
+    },
+    {
+      "name": "gettext",
+      "platform": "osx"
+    },
+    {
+      "name": "libuuid",
+      "platform": "!windows & !uwp & !osx"
+    },
+    {
+      "name": "libxml2",
+      "platform": "!windows & !uwp"
+    }
+  ]
+}