Compressed Lua files and added physics attacker, so players now get credited for train kills

Added weapon icon and viewmodel idle animations. Fixed Lua error when undoing trains. Changed undo names. Removed debug code and materials.

Added timer for removing the train: 2.5 seconds for toy train and 5 seconds for normal train. Changed the undo names.

Made the small train distance to player shorter. Changed weapon sounds.

Initial addon creation.