Fix the exec() calls in Create module's Init.py and InitGui.py to pass
__file__ and __name__ in the globals dict. The silo workbench code uses
__file__ to resolve icon paths, but exec() without explicit globals
does not provide it, causing 'name __file__ is not defined' errors.
Also add three silo integration enhancements to InitGui.py:
- First-startup check: launches Silo_Settings dialog if API URL is not
configured on first run
- File menu injection: WorkbenchManipulator inserts Silo Open, Save,
and Commit commands into the File menu across all workbenches
- Database activity panel: dock widget showing recent silo items,
displayed on the right side of the main window
- Add src/Mod/Create/ module to handle addon loading
- Init.py adds mods/ztools and mods/silo to sys.path at startup
- InitGui.py loads workbenches from addon InitGui.py files
- CMakeLists.txt installs Create module and mods/ directory
- Set ZToolsWorkbench as default startup workbench in preferences
