Patch/Update V2.1.x.33

Tonight we're releasing support for MacOS in V2!

Included are also some slight bug fixes, including an upgrade to Unity that should have resolved the crashing bug some people were having.

-Added support for MacOS.
-Updated to Unity 2018.2.1 - this should resolve the crashing issue some people were having.
-Slightly changed cat tutorial.
-Fixed zombie SFX not playing sometimes.
-Fixed save bug in hidden room where if you save after finding muriel but die before entering muriels level some weird things start to happen in game due to order mismatch