New+ Support for variables in template filenames (35287)

[cgaarden]

Summary of the Pull Request

Added support for variables in template filenames

Variables supported includes

1. Date and time component variables, such as $YYYY, $YY, $MM, $DD, - using the same syntax and implementation as in PowerRename
2. $PARENT_FOLDER_NAME - will replace variable with the name of the parent folder
3. %environment-variable% - will replace variable with the value of the corresponding environment variable

Example:
Template filename:
$YYYY-$MM-%DD, $hh - $PARENT_FOLDER_NAME by %USERNAME%

Filename on create becomes:
2025-01-25, 02 - PowerShell project by cgaarden

PR Checklist

• Closes: New+ - can we input a variable when creating folders? #35287
• Also closes:
• **35287
• **35984
• **36615
• **36425
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• [n/a] Tests: Added/updated and all pass
• Localization: All end user facing strings can be localized
• [n/a] Dev docs: Added/updated
• [n/a] New binaries: Added on the required places
  • [n/a] JSON for signing for new binaries
  • [n/a] WXS for installer for new binaries and localization folder
  • [n/a] YML for CI pipeline for new test projects
  • [n/a] YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: Please add Chinese Pinyin initials support to PowerToys Run launcher #5285
  PowerToys New+ variable support in template filenames -- documentation related updates MicrosoftDocs/windows-dev-docs#5285

Detailed Description of the Pull Request / Additional comments

SHFileOperation API related

Still using SHFileOperation API - may change this in a future PR as the current implementation requires iterating through files multiple times (not really that impactful unless a template folder contains 100s+ of files/subfolders
Fixed an issue on ARM64 when depending on SHFileOperation to provide filename remapping

Minor refactoring

To help with support the variable support

Minor exception handling logic

To help get information on where New+ menu isn't being displayed

Validation Steps Performed

1. Windows 10 clean install, with lots of different template permutations
2. Windows 11 clean and update install, with lots of different template permutations
3. Windows 11 ARM64 and x64, with lots of different template permutations
4. Template folders with subitems with multiple variables within filenames
5. Template items starting with digits and spaces, e.g. 13. $YYYY-$MM-$DD PTA meeting minutes and actions
6. Rename mode is entered as expected for files and folder based templates, also when creating template with same name multiple times (x) in Arabic script
7. Validated that GPO ConfigureEnabledUtilityNewPlus, NewPlusHideTemplateFilenameExtension, NewPlusReplaceVariablesInTemplateFilenames are working as intended

Example template folder + corresponding context menu

Example of project including subitems

New+ settings

(debug)

New+ related GPO policies