Update 0.19

The main feature of this update is land monsters. I also made some tools to help me with the development, but they are not in the game.

I'll try to do smaller updates more often now.

Change log:

• Added first land monsters (caterpillars).

• Added process priority option - try setting it higher if you experience lag.

• Added left-handed HUD option - swapping spells on screen to match swapped mouse buttons.

• Missile collision with ground is less strict now, making it easier to shoot over hills etc.

• Repacked some textures to use less memory.

• Improved fluid simulation performance a bit.

• World colors are selected from predefined palettes now instead of being randomly generated.

• Added profiling of various game systems on the performance stats screen.