Map editor

This is a natural upgrade of the map editor i've been working on

This is a natural upgrade of the map editor i've been working on, it has several important new features:

- More optimizations
- Support for import and export of removebuilding generated code lines
- support for quick clipboard import
- support for loading & displaying COLLISION meshes (when you are puzzled why there are holes in your map - remember if you turn this on, do it before loading the map & set ambient brightness to MINIMUM. )
- Multiple object selection support (you can move things with arrow movement keys, mouse movement of multiple objects does not yet work, neither does rotation work very well.)
- Improved object dragging (does not work on multiple object selection yet)