Third hotfix for 0.15

Third round of fixes and improvements.

• Fixed crash when rendering shapes with invalid details numbers
  
• Fixed initial window size of scriptAIManager
  
• Fixed autobello thumbnails
  
• Fixed custom groundmodel not being loaded
  
• Fixed Some utility function using default userpath instead of actual defined userpath (may have fixed issues inside the torque3D editor)
  
• Launcher: Fixed open dialog failing to open on some specific configuration
  

An up to date list of known issues can be found in the dedicated Feedback & Bug Reporting Thread here.
Instructions on how to update the game here.