Kobolds

• Cleaned up some code.
• Improved trades with Kobold Enchanters.
• Added a loot table for enchanted tools (Kobold Enchanters now has a 10% chance of giving an enchanted kobold tool from this table).
• Removed crafting recipes for kobold potions.
• Removed Crimson Mixture.
• Added Kobold Potion of Levitation (Levitation for 12 seconds).
• Added Kobold Potion of Resistance (Resistance for 36 seconds).

Note: This update was originally focus on just some clean-up but ended up adjusting potion related things. Due to the improved trading with Kobold Enchanters, potions are very common from them and thus I decided to remove them from being craftable, making them a trade only item from Kobold Enchanters. Enchanted tools has decreased dramatically and the chance for the mending book has went up a little due to these improvements overall. I also decided to try out the idea of adding new potions base on the effects previously unobtainable as potions. This is mostly a test with the idea to see how it feels and how well it is accepted.