Blocks from Minecraft 1.5 Snapshots

Major changes:
- Rewrote & refactored block tile generation code;
- Block IDs are no more hard-coded (for the most part);
- Added external block configuration files;
- Added ability to apply few filters to textures (when generating block
tiles);
New blocks from upcoming Minecraft 1.5:
- Trapped Chest;
- Weighted pressure plates (light + heavy);
- Redstone comparator;
- Daylight Sensor;
- Block of Redstone;
- Nether Quartz Ore;
- Hopper;
- Block of Quartz;
- Quartz Stairs;
- Quartz Slab;
- Activator Rail;
- Dropper.
Other changes:
- Added few functions for manipulating RGBAImage;
- Changed to UNIX EOL formatting in modified files.