Fix "missing sound common/null.wav" when throwing grenades Gravity Gun consistency improvements Fixed mass-adjusted punt forces being applied to Mega Gravity Gun Fixed Gravity Gun forces being Launch-forces at all times for prop_physics due to a previous fix for `spin_none` physics interaction Set the particle orientation in Editor on creation Sets the first control point for the selected particle system preview, so they are oriented correctly from the start. Mimics how the particle previews do it in the particle list. Fix month checking for loading screen Remove Ep1, Ep2 and Lost Coast mounting All of those are now part of the Half-Life 2 mounting option Rename "Operation was aborted by an application callback" error Fixed some more crashy issues with particle constraints Added ability to override precipitation particles It will not be functional yet due to networking changes being required