Revert "Less mad math. Use tools already available!"

This reverts commit 2c1ed0f61d30496b93c6b30840f0916e065f917d.

Revert "Refactored Potion to PotionItem. Potions can now be thrown (With wrong speed/angle currently)"

This reverts commit 18dec182980a0d32f2efb762b93bb2dcee586f17.
Rename potion to PotionItem.
Added Potion throwing! (This commit is to fix the history)