Code clean-up/revamp

PLEASE DELETE AND UPDATE YOUR CONFIGURATION FILE.

Fixed some spelling errors

ADDED:
Mob damage indicator - To go along with the blood effect, I've added a dmg indicator that spawns a hologram (invisible Armor stand) for 5 seconds before vanishing.

this can be toggled in the config or via the Admin panel. The icon can also be changed via the config. (PLEASE USE UNICODE FOR THIS (example: \u2764) although the yml will already translate that to an icon when you load the plugin).