More Minecrafty

New features:

• Block placement and destruction.
• Highlight blocks we're looking at.
  • Implement an efficient ray-casting algorithm
• Better map generation.
  • Simple trees and water.
  • Small cliffs.
• Textured grass blocks.
  • New textures are easy to add now, but I kinda like this simple look.

Controls:

• Mouse look around
• WASD move around
• Shift/space move up/down
• ESC quit
• N toggle noclip
• P cycle polygon mode
• [+ or numpad+] increase render distance
• [- or numpad-] decrease render distance (without unloading existing chunks)
• C toggle face culling
• Left-click destroy block
• Right-click place grass block