[+] Better management of statusLabel messages for Editors Setup
[+] New Matrix and New Event File buttons now create a new blank file from scratch
[+] Loading maps from a Matrix that has no Headers Tab will search for usages of that Matrix in all Headers
[+] Map model can be rotated in multiple directions at the same time
- Renamed Matrix class to GameMatrix to avoid ambiguity
- Moved some accessor methods from MainWindow to RomInfo
- Moved editor setup methods to respective sections
- Fixed lots of problems with Japanese DP roms [either not loading or partially functioning]
