Left mouse click now confirms a talent use instead of rigth click

Right click on the map will now bring up a list of possible actions (pickup item, move to, use stairs, ...). Thegame is now fully playable using just the mouse!


git-svn-id: http://svn.net-core.org/repos/t-engine4@1245 51575b47-30f0-44d4-a5cc-537603b46e54