Remove camelCase module functions (setScale, findAll, getMetrics, setDevConsole), closes #304

Breaking API change: removes 4 camelCase function aliases from the mcrfpy
module. The snake_case equivalents (set_scale, find_all, get_metrics,
set_dev_console) remain and are the canonical API going forward.

- Removed setScale, findAll, getMetrics, setDevConsole from mcrfpyMethods[]
- Updated game scripts to use snake_case names
- Updated test scripts to use snake_case names
- Removed camelCase entries from type stubs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

stubs/mcrfpy/__init__.pyi

@@ -1298,22 +1298,10 @@ def exit() -> None:
     """Cleanly shut down the game engine and exit the application."""
     ...
 
-def setScale(multiplier: float) -> None:
-    """Scale the game window size (deprecated - use Window.resolution)."""
-    ...
-
 def find(name: str, scene: Optional[str] = None) -> Optional[UIElement]:
     """Find the first UI element with the specified name."""
     ...
 
-def findAll(pattern: str, scene: Optional[str] = None) -> List[UIElement]:
-    """Find all UI elements matching a name pattern (supports * wildcards)."""
-    ...
-
-def getMetrics() -> Dict[str, Union[int, float]]:
-    """Get current performance metrics."""
-    ...
-
 def step(dt: float) -> None:
     """Advance the game loop by dt seconds (headless mode only)."""
     ...