[v0.3.0] Fire and day-night cycle

-Thermal simulation
-Fire
-Pyrite
-Day-night cycle
-Made slime edible
-Made it easier to grab small objects
-Added some sound effects
-Probably supported Windows MR
-Other minor fixes

Sparks are produced when a stone and pyrite (golden-colored stone) collide. You can start a fire by hitting the shredded leaves with the sparks.