New engine interface PlayerMouse, this handles the default mouse actions, so...

New engine interface PlayerMouse, this handles the default mouse actions, so that modules can easily implent them. You are encouraged to switch to use it.
New engine interface GameTargeting, this handles all the complex targeting code for you. You are encouraged to switch to use it.
Updated both ToME and example module to the new interfaces


git-svn-id: http://svn.net-core.org/repos/t-engine4@958 51575b47-30f0-44d4-a5cc-537603b46e54