[MapEditor] Added a tool to edit the items data list
[MapEditor] Made it possible for a tile to have more than one of each item
[MapEditor] Option in Item eraser to clear all items on a tile or just remove the top one.
[MapEditor] Possible to remove an selected item from the data tool item list
[MapEditor] Possible to reorder items from the data tool item list
[MapEditor] Showing the clipboard band
[MapEditor] Keyboard shortcuts for cut, copy and paste
[MapEditor] Move the map around with the arrow keys
[MapEditor] Added history for cut and paste and keyboard shortcuts for undo, redo and save
[MapEditor] Items should be displayed on top of a item when placed on same tile
[MapEditor] Change the radius fill so that all selected tiles get filled instead
Merge pull request #44 from frkarl/develop

[MapEditor] New tools and support for copy, cut and paste