Flammenwerfer wip

Adds a bunch of stuff to the fire system

You now can set off atmos fires if you're on fire (like a lit welder)
Things can add fire stacks and IgniteMob() now checks that you have at least one stack before igniting you
Lasers add 5 stacks and ignite you
Heat Rays add 20 stacks and ignite you (But do no damage themselves)
You can now resist to shed off 5 fire stacks and stun yourself for a small period of time, if you hit 0 stacks or below, you extinguish yourself
Welders can ignite you, but don't add stacks, so you need to add stacks from another source