Fixed a bug in the thing/linedef argument input boxes that caused an incorrect value when only increased/decreased with the up/down buttons
@ Added new project for Mass Undo/Redo plugin
@ fixed bug that caused a question message to save the map appear on closing after saving the map
@ working on NumericTextbox versions with up/down buttons and dropdown lists
- Fixed bug that allowed pasting geometry in visual mode (and the geometry becomes erroneous)
- Highlight and selection colors are now hidden while dragging textures.