Tested code for new Railgun items
* "Rear Railgun Controller" - Rearward facing Railgun controller
* "Railgun Single Loader" - Vertical loader with 1 shell capacity
* "Forward Railgun Loader" - Forward facing loader with 1 shell capacity
* "Rear Railgun Loader" - Rearward facing loader with 1 shell capacity
Gives sub makers more variety and different ways to arm subs. Can also be used to make a challenging balance with the weapons that requires more teamwork to operate. Also useful for simulating torpedo's tubes
Sprite example:
https://imgur.com/muAIF9P
All items tested and implemented.
ClasticM
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