Items lost in 0.1 -> 0.2 transition

[not-fl3]

In our transition to a p2p multiplayer ready architecture, many of our existing weapons were left out of the big refactor. We need to add them back!

For reference material (and the right person to ask for pointers) check out any of these weapons:
https://github.com/fishfight/FishFight/pulls?q=is%3Apr+is%3Aclosed+label%3Aitem

You can get the most up-to-date version of the items before the refactor on this month old version:
https://github.com/fishfight/FishFight/tree/3ba21b6185114a5c69c791c12fc1e0884bfcb102

Standard

• jellyfish Jellyfish reimplementation #138
• grenade Grenades #114
• turtleshell Turtle Shell reimplementation #105
• shoes Shoes reimplementation #112
• mines Put mines back. #99
• cannon Standardised explosives #113
• kickbomb Reimplementation of kick bomb #199

Environmental (Doc)

• shark rain Reimplement Shark Rain #141
• galleon Reimplement Galleon Weapon #131
• volcano Volcano #133
• curse punted to v0.4