Add ability to format your branch

[JohnMcPMS]

Summary of the Pull Request

Adds -Branch to the format script to target files changed by your current branch.

PR Checklist

• Closes: Link to issue #xxx
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

I am always forgetting to format files before committing them, so I added a way to just target my current branch. By default it diffs against master, but you can pass -BaseBranch branch if needed.

Validation Steps Performed

cmake generated and ran it locally, found expected files.

[Copilot]

Copilot review overview

🟡 Changes recommended

Address untracked file handling and preserve the selected base branch in verification remediation.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 1

Open (1)

• Include non-ignored untracked files in branch change detection · New

What changed in this PR

Adds branch-scoped formatting with configurable base branches and documents the workflow.

Changes:

• Adds -Branch and -BaseBranch options.
• Selects files changed from the configured base branch.
• Documents branch formatting usage.

File	Summary
tools/​FormatSource.ps1.in	Implements branch-based file selection; requires handling untracked files and preserving BaseBranch in remediation commands.
doc/​docs/​dev-loop.md	Documents the new branch formatting workflow.

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[Copilot]

Copilot review overview

🟢 Approval recommended

The only noted issue is a minor nit regarding preserving -BaseBranch in the remediation command.

Review effort: Lite
Findings: None

Resolved since last review (1)

• Include non-ignored untracked files in branch change detection