docs(reference): add comprehensive Menu and Command Group IDs reference (#116)

Add complete reference of all Visual Studio menu identifiers:
- Main menu bar and top-level menus (File, Edit, View, etc.)
- All menu groups (IDG_VS_*) for each menu
- All toolbars (IDM_VS_TOOL_*)
- All toolbar groups
- Editor menus and groups
- Code window groups
- Cascade/flyout menus
- All context menus (IDM_VS_CTXT_*) categorized by location:
  - Solution Explorer (solution, project, folder, item, references)
  - Multi-selection context menus
  - Code editor
  - Class View
  - Object Browser
  - Tool windows
  - Window management
  - Web projects
- Menu controller IDs
- Special menus

This is the complete listing from vsshlids.h in the VS SDK.

Author: CalvinAllen