v0.1.1 release; network and mushrooms!

Changes:

• Removed the exit
• Removed dust
• Wrote the network stack
• Added game-of-life mushrooms (single player)
• Added dynamic water (single player)
• Moved world generation to a separate thread

FIrst release. v0.1

What we have so far:

Game play features:

• Random walk based landscape generation
• Ability to break walls with a pickaxe
• Ability to collect coins and dust
• One winning condition: find the exit

Engine features:

• Zoom in/out
• Select the cursor in the 9 nodes square around the player