VS Code CMake Helper: first implementation

CMake the way CLion does it (profiles and presets, targets, run and debug
configurations, CTest), moved out of personal-assistant's cmake-extension
and renamed from CMake Targets.

- Gitea Actions: typecheck, package the .vsix, release it on a v* tag
- Updates: the latest Gitea release is looked at every 10 minutes and
  offered for install; a private repository's token in the secret storage
- cmakeHelper.toolbar: the toolbar in the status bar, the editors' title,
  or VS Code's title bar (workbench.html patched, offered again after
  VS Code or extension updates)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

media/cmake.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linejoin="round"><path d="M12 2 2 21h20L12 2Z"/><path d="M12 2v13l10 6"/><path d="M12 15 2 21"/></svg>