Added: Undo/Redo functionality in the MapEditor. Thanks Alan for the patch in issue 1552!

Added: Street lamps and the dead looking tree can be placed in the Map Editor. Adds issue 1562.


git-svn-id: http://corsix-th.googlecode.com/svn/trunk@2244 c39591fa-788f-11de-a72b-d90af8dea425