Epidemics

Hello everyone,

Yes it's been nearly 2 years since I started doing this and with several attempts at assaulting 
the action queue, I present to you epidemics :scream:.

I will update this later with more info about the commits.

**PLEASE NOTE**: If you are testing this there are a lot of debug strings still in the console for reference,
also the green infected icon will appear on the infected patient's heads all of the time so they are easier to track when testing, in the final version you will not see these icons until after the player receives the fax warning them. 

This request needs a lot of testing for balance especially - again I will update with more details later about how things work exactly but feel free to test this out how it stands it should be pretty much there. 

:peach:-y