Fix the names of several Grace Manewitz images to have correct casing.
Tweaked mouseover code to avoid calculating region for mouseover image where possible by moving it into the short-circuiting check, and using pre-calculated axis-aligned region to avoid calculating current region at all in the method.

Tweaked rebound out of exclusion region to exit early if the exclusion region is empty, and thus avoid calculating the current region in this case.
Added a missing check for interactions being enabled when starting interactions.
Remove thread safety from PonyContext since it is actually updated and accessed from the animator thread and so does not need the safety. This will help speed up the Update method of Pony which spent a lot of time acquiring the various locks to get the property values.
Update gitattributes to ensure .command files use Unix style line endings. Remove code that duplicates this effort from the Release Tool.
Exposed the z-ordering function as an overridable property of PonyAnimator. Moved z ordering specializations into derived classes, and moved house cycling down into DesktopPonyAnimator.

Manually squared CursorAvoidanceRadius in Pony.ReboundToAvoidCursor to improve speed.
Change setter of WinFormSpriteInterface.ShowInTaskbar to only invoke on UI thread if the value is different from the current value.