Amulet-map-editor

Additions:
- A top down 2D view for easier navigation and viewing.
- A chunk tool for modification of chunks.
- A prune operation has been added to the chunk tool.
- Importing and exporting of the sponge schematic format
- Drag and drop importing
- A better selection box
- Partially added language support

Changes
- Moved logic out of the canvas and given control to the tools and operations.
- Improved OpenGL support
- Updated the leveldb library
- Cleaned up the pyinstaller build

Fixes the pick block button in the internal operations.
Modified the wx operation classes to increase what they are capable of. This will have broken most wx operations. see /pull/223
Fixed an issue exporting schematic files.
Fixed an issue with the nbt library.

Added importing and exporting of the Sponge Schematic format.
Added drag and drop importing.
Simplified the import tool.

Fixed some issues with height and light values.
Fixed some issues with leveldb for some Windows users.
Fixed the set biome tool not being listed.
Cached texture atlas so loading should be a little faster.
Fixed a render issue causing the world to be upside down.

Improved language support for similar languages. If languages with different regions are similar enough, they can share a lang file without the region extension and the region specific file can just contain the translations that are different.
Hopefully fixed some more OpenGL issues.
Cleaned up the built release to remove the unused source code.
minecraft:cave_air is now treated like normal air in the 3D editor.
Fixed some issues with the selection being unpredictable.
Improved the paste tool to bring it in line with how it behaved before the recent rewrites.

Previously all the source code was distributed the program and in some places it was run from the source and others it was run from code within the executable. This build should have cleaned that all up so it is all run from the executable.
Custom user extensions will still be run from the source.