Update version 0.7

I have received feedback on plenty of things and have updated the game accordingly.

New:
* Added skyboxes to each environment
* Added some snow to arctic

Fixes:
* Improved overall performance
* Decreased odds of receiving unsolvable grids (50/50s) significantly
* Lowered overall game difficulty
* Fixed colors per environment
* Fixed post processing per environment
* Timer resets when game starts instead of when game ends
* Fixed various bugs