Artillery interface

Fixed the old scatter markers:
https://dl.dropboxusercontent.com/u/204076271/screen00012.png

Added targeting text
https://dl.dropboxusercontent.com/u/204076271/screen00013.png
https://dl.dropboxusercontent.com/u/204076271/screen00014.png
https://dl.dropboxusercontent.com/u/204076271/screen00015.png

I added a "zeroed" UnitRulesParam updated from unit_indirectFireAccuracy.lua, so it can be also read from the healthbars adding an aura icon for the status of the LOS bonus.