support scoop installation location

Author: sharpchen

powershell/command_palette_installer.ps1

@@ -23,6 +23,11 @@ if (Test-Path env:MPV_CONFIG_DIR) {
 } elseif (Test-Path "$env:APPDATA/mpv") {
     Write-Output "Installing into (current mpv user config):"
     $ConfigDir = "$env:APPDATA/mpv"
+} elseif ((Get-Command scoop -ea SilentlyContinue) -and (Test-Path (scoop which mpv))) {
+    Write-Output "Installing into scoop installation location"
+    $path = Join-Path (Split-Path (scoop which mpv)) "portable_config"
+    New-Item -ItemType Directory -Path $path -ea SilentlyContinue | Out-Null
+    $ConfigDir = Resolve-Path $path
 } else {
     Write-Output "Installing into current directory:"
     $ConfigDir = "$PWD"