Don't search for fFatigueReturnBase and fFatigueReturnMult every frame
Cache GMSTs in getDerivedDisposition
Revert "Transfer item ownership to the buyer if item wasn't stolen"

Fixes #1953.

This reverts commit 5d77c5e8cac1c506f50a9e415dfeb489c0704ddb.
Attempt to fix Clang warnings
Disable topics list visually when in a choice
Add spacing between buttons to TabControl skin
Add debug window (F10), displays Bullet's profiler output
Bullet optimization: Don't update AABBs of static objects every frame
Rename some skin files to .skin.xml for consistency
Forgot const