[0.0.2] Spells overhaul #38

The current system is very cluncky and isn't as flexible as I'd want. We need a simpler solution for casting all kinds of spells and the hotbar needs to dynamically change based off how much stuff you're using.

Here's a list of things that needs to be done :

• Clean up the spell casting code and make it simpler but more flexible to allow for all kinds of uses (not just spells)
• Allow for the hotbar to carry spells and other actions (I.e, eating an item, throwing a potion, etc)
• The hotbar should allow for all keybinds to be used, not just the numpad.
• Spells at the moment don't have particles spawning on impact with walls, something that the original TWC had.
• Allow for spells to be used by other entities that are not players.