StrongDMM v0.0.3

Fixes

• Hash collision between tile items which was resulted in incorrect instance swapping between similar objects. (Unpredictable diff)
• #4 Added appropriate removing of "modified" asterisk on map saving.

New Features

• User will be proposed to save map if he's closing editor with unsaved changes.
• Added "Recent Environments" and "Recent Maps" menus in menubar.
  They will help to open previously opened envs and maps quickly.
• "Save All" menu bar option. Hotkey: Ctrl + Shift + S
  Saves all changes on all opened maps.
• "Close" and "Close All" menu bar options. Hotkeys: Ctrl + W and Ctrl + Shift + W
  Closes selected/all maps. If map which should be closed has unsaved changes, then user will be proposed to save them.