OpenMiner v0.0.6

Test version for Win32.

Changelog:

• 53bb1c1 - Biomes! 🏜
• 8e5f78f - Inventory cubes rendering fixed
• be1e49c - Portal block and dimensions! 🎉
• 8d44d25 - Now all clients are aware when a player disconnects
• ff516ec - Basic sky API added
• 3591734 - Fixed crosshair size on small screens
• c5510ee - Fixed crash related to singleplayer games