fixed android app name
added android controller libraries
fixed GwtLauncher
check for valid sound files in sounds folder.
added support for strafing and targeting.
RadarSensor: changed to support a list of target classes
guards can no longer be attacked.

Player: added radar sensor to detect targetable objects (Enemy and NPC)
Player: Talk action is available if targeting an NPC, regardless of location.
Player: aim at target
Entity: changed to support facing any angle.
Enemy: canDamage flag
Guard: set Enemy.canDamage(false)
Physics: added get targetable object.
Physics: added targetable sensor category
FindTargetableObjectAtPointCallback: query the physics world to find targetable object by position. used for targeting by touch.
Game: added code for handling player targeting and strafing, draw arrows over targetable objects.
Controls: added strafe button. Added target button (key controls only) and support for grabbing touch presses that did not land on an touch control element. cleaned up WASD code.