Refactor extension functions to add_extensions scripts

src/scripts/extensions/firebird.ps1

@@ -0,0 +1,20 @@
+Function Add-Choco() {
+  try {
+    if($null -eq (Get-Command -Name choco.exe -ErrorAction SilentlyContinue)) {
+      # Source: https://docs.chocolatey.org/en-us/choco/setup
+      Set-ExecutionPolicy Bypass -Scope Process -Force
+      [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072
+      Invoke-Expression ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
+    }
+  } catch { }
+}
+
+Function Add-Firebird() {
+  Add-Choco > $null 2>&1
+  choco install firebird -params '/ClientAndDevTools' -y --force > $null 2>&1
+  if((Get-ChildItem $env:ProgramFiles\**\**\fbclient.dll | Measure-Object).Count -eq 1) {
+    Add-Extension pdo_firebird
+  } else {
+    Add-Log $cross pdo_firebird "Could not install pdo_firebird on PHP $( $installed.FullVersion )"
+  }
+}