Internal bleeding nerfed slightly, gas mask filters plasma and n2o, overdoses, lots of other tweaks

Changed pin to a 4 digit number. Game year standardised to this year +544.

Added vacuum flask to bar.

Changed icon path for custom items due to compile times.

Fuel tanks explode from fire.

Readjusts pill chems due to overdose. Adds pill dissolve logging.

Gas mask filters Plasma and N2O.

Recommitting PA sprites by Flash Kirby.

Overdose added. Most chemicals over 30 units now cause constant toxic damage. Alcohol tweaked, excessive alcohol is poisonous. Chemistry-Reagents reorganized. Side effects removed. All toxins moved to toxins parent.

Internal bleeding tweaked. Cryo and Bicaridine will prevent IB from bleeding and getting worse. Bicaridine over 30 units will slowly heal IB. IB cannot be completely healed by bicaridine until 10 minutes after getting IB. Bleeding rate for IB reduced.