Homebrew rule: damage threshold mechanic

[knightofrubus]

Changed some core math around(no need to multiply)
Added in what happens when you're lit on fire might need some further tweaks to that but should at least 'work'. The math changes came around after talking with the lead designer for 4th as it might be a direction the next edition eventually goes.

[knightofrubus]

Hyper and hypothermia rules are now in. Also, removed the penalty from SP loss.

[knightofrubus]

One last update as now Non-lethal damage is factored as is how automatic fire and a few other did bits operate. Calling it a tentative 'done' for now.