update version
Structure for new world format in place
Support for 1.2.3
Update versions and tweak build script.
Add BCL
Lots of improvements to Undo/Redo system. Less memory usage, streaming files, faster. Oh, and it doesn't crash every time you undo.
update bccl
Lots of clipboard improvements. No longer limited to 4000x4000. Export/import working.
update all tile data