Moved logic for camera moving from VeinsWindow.pollKeyboardInput() to
Camera class.
Put classes in packages and separated other resources from classes.
Refactored HUD class.
Refactored VeinsWindow.pollMouseInput().
Code cleaning.
Cleaned code, renamed some variables.
Refactored VeinsModel, added loading model to VeinsRenderer, deleted
ModelLoaderUtil.
Moved variables which store orientation and grab from VeinsRenderer to
VeinsModel.