- implemented Join Sectors and Merge Sectors
- added an ordered selection list to SectorsMode
- removed selection on undo/redo
- Interface AddMenu now completes short action names on menu items Tag property to fully qualified action names depending on calling plugin
- volatile mode may not be started from a volatile mode by shortcut key!
- added ability to cancel an editing mode change
- added mipmap levels setting to images (this fixes blurred fonts in low-quality display)