Map Editor Fixes/Improvements (by Buggler)
- Better UI feedback after last item deleted from item stack in editor item mode
- Improved editor room number increment code. 'Shift + LMB' when drawing room numbers will reuse same room number on next input
- externalized hardcoded button tooltip text in editor tile selection window
git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@6825 3b4a5df2-a311-0410-b5c6-a8a6f20db521