HeavenVR update: leaderboards and important fixes

This HeavenVR update adds VR-exclusive leaderboards. Every leaderboard in the game now has a VR variant, and while playing HeavenVR you will only be able to submit your scores to those. You will also only be able to see scores from the VR leaderboards.

Bug fixes:

• Fixed errors + black screen when the game is ran for the first time with the VR mod enabled.
• Fixed some large portions of later levels missing, making them pretty much unbeatable.