Refactor extension functions to add_extensions scripts

src/scripts/extensions/blackfire.ps1

@@ -0,0 +1,32 @@
+# Function to install blackfire extension.
+Function Add-Blackfire() {
+  Param (
+    [Parameter(Position = 0, Mandatory = $true)]
+    [ValidateNotNull()]
+    [string]
+    $extension
+  )
+  try {
+    $no_dot_version = $version.replace('.', '')
+    $extension_version = $extension.split('-')[1]
+    if ($extension_version -notmatch "\S") {
+        if($version -lt '7.0') {
+            $extension_version = '1.50.0'
+        } else {
+            $extension_version = (Invoke-RestMethod https://blackfire.io/api/v1/releases).probe.php
+        }
+    }
+    if (Test-Path $ext_dir\blackfire.dll) {
+        Enable-PhpExtension -Extension blackfire -Path $php_dir
+        $status="Enabled"
+    } else {
+        $nts = if (!$installed.ThreadSafe) { "_nts" } else { "" }
+        Invoke-WebRequest -Uri "https://packages.blackfire.io/binaries/blackfire-php/${extension_version}/blackfire-php-windows_${arch}-php-${no_dot_version}${nts}.dll" -OutFile $ext_dir\blackfire.dll > $null 2>&1
+        Enable-PhpExtension -Extension blackfire -Path $php_dir
+        $status="Installed and enabled"
+    }
+    Add-Log $tick $extension $status
+  } catch {
+    Add-Log $cross $extension "Could not install $extension on PHP $($installed.FullVersion)"
+  }
+}