ci: Create Powershell equivalent for format script

- Enable to check for style using clang-format under Windows
- For local use before commit.
   Adding it to a pre-commit hook might be useful

.ci/scripts/format/script.ps1

@@ -0,0 +1,67 @@
+# SPDX-FileCopyrightText: 2019 yuzu Emulator Project
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+param (
+    [string]$ClangPath
+)
+
+Set-PSDebug -Trace 1
+
+# Set good encoding for input
+$OutputEncoding = [Console]::InputEncoding = [Console]::OutputEncoding = New-Object System.Text.UTF8Encoding
+# Set good encoding for clang-output
+$PSDefaultParameterValues['*:Encoding'] = 'utf8'
+
+$src_trailing=Get-ChildItem -Path src -Exclude "*.png","*.jpg","*.jar" -Recurse | Select-String -Pattern '\s$' -List | Select-Object -Property Path, LineNumber, Line
+$files_trailing=Get-ChildItem -Path "*.txt", "*.md", "Doxyfile", ".gitignore", ".gitmodules", ".ci*", "dist/*.desktop", "dist/*.svg", "dist/*.xml" | Select-String -Pattern '\s$' -List | Select-Object -Property Path, LineNumber, Line
+
+if ($src_trailing -or $files_trailing) {
+    Write-Output $src_trailing
+    Write-Output $files_trailing
+    Write-Output "`nTrailing whitespace found, aborting"
+    exit 1
+}
+
+# Set default clang-format
+if ($ClangPath) {
+    if (Test-Path $ClangPath) {
+        $CLANG_FORMAT=$ClangPath
+    } else {
+        Write-Error 'Invalid path given as ClangPath'
+        exit 1
+    }
+} else {
+    if (-not $CLANG_FORMAT) {
+        $CLANG_FORMAT='build/externals/clang-format-15.exe'
+    }
+}
+Invoke-expression "$CLANG_FORMAT --version"
+
+if ("$TRAVIS_EVENT_TYPE" -eq 'pull_request') {
+    # Get list of every file modified in this pull request
+    $files_to_lint="$(git diff --name-only --diff-filter=ACMRTUXB $TRAVIS_COMMIT_RANGE | grep '^src/[^.]*[.]\(cpp\|h\)$')"
+} else {
+    # Check everything for branch pushes
+    $files_to_lint=Get-ChildItem -Path src -Include '*.cpp','*.h' -Recurse
+}
+
+# Turn off tracing for this because it's too verbose
+Set-PSDebug -Trace 0
+
+foreach  ($f in $files_to_lint) {
+    $orig=Get-Content $f | %{$i = 1} { New-Object psobject -prop @{LineNum=$i;Text=$_}; $i++}
+    $formated=(Invoke-expression "$CLANG_FORMAT -style=file '$f'") | %{$i = 1} { New-Object psobject -prop @{LineNum=$i;Text=$_}; $i++}
+    $diff=Compare-Object $orig $formated -Property Text -PassThru
+
+    if ($diff) {
+        Write-Output "!!! $f not compliant to coding style, here is the fix:"
+        Write-Output $diff | Format-Table
+        $fail=1
+    }
+}
+
+Set-PSDebug -Trace 0
+
+if ($fail -eq 1) {
+    exit 1
+}