Merge branch 'Misc' into 'master'

A few different things

Hi DarkGod, I baked you some code! :D

Contains 5 different things, which are separate should you not want all of them.
1: Changes disease spreading code to be more general to works nicely with any future or addon diseases.
2: Adds bleeding damage to Bone spells. They are a little bit weak and then I won't have to hack them for Witherer. :)
3: Balances some creatures with innate 100 points per turn resource regeneration.
4: Adds more zone auras which include handy tooltips for explaining things like finding bubbles when underwater. Also adds some flavourful modifiers.
5: Addresses a bug with the hasShield() change I found while testing this.