Milestone 3 Alpha 1

Changelog:

• Removed New Super Mario Bros. 2 support
• Removed PyQtRibbon
• Removed TPLLib
• Fixed creating new levels
• Fixed saving
• Fixed importing areas from another level
• Added snapping zone to grid
• Fixed deselecting paths
• Added a new TPL decoder
• Added a new LH decompressor
• Added a new LZ77 decompressor
• Updated the spritedata for NSMBW and NewerSMBW
• Fixed sprite categories bug
• Fixed painting stamps and comments
• Re-enabled selecting patches
• Fixed liquids, snow effect, lava particals, and fog rendering
• Fixed/added themes
• Fixed tileset animations
• Minor bug fixes