Update 0.24 (Aug 26) - The Dwarves update!

Lots of new content on this update! Mines - a new level type with VERY dark environment, and a new level showcasing it!

A list with the goods follows:

0.24.0, Aug 26th
- LEVEL: New level - Blackrock Mines
- Added: New Level type - Mines
- Added: Dungeon walls
- Added: 4 new floor types
- Added: 2 new rock types
- Added: Reagent - Diamong
- Added: New 'road' - Minetracks
- Added: New 'light' - Minecart
- Added: New weapon: pickaxe
- Added: Dwarven bed
- Added: Dwarven door
- Added: Small bathroom window
- Added: New shelf
- Added: Wall mirror
- Added: Wooden Arch
- Fixed several issues