Fourth hotfix for 0.15

Some more fixes and improvements.

• Added guard for missing default.pc
  
• Fixed crashdump being saved to default userpath even after changing it
  
• Fixed default userpath being incorrect if Windows Defender "ransomware protection" is enabled
  
• Fixed crash on render related to shadow materials
  
• Fixed missing GPU meters on the performace UI
  

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.