Added new item - hailer. Use in hand to make it say HALT! SECURITY!
Should help in asking people to halt while running.
Changed way substitute tools are handled.
Now all tools have chance of success. Proper ones have 100.
If tool has less than 100 chance of success, it can fail the step.
Since organ processing interval is so big, sets bleeding manually so hemostat step would work.
Added hailers to the Sec closets.
Moved blood compatibility check to the related file.
DRY BLOOD FOR THE BLOOD GOD.
Blood will now dry up in around half an hour.

Also moved blood drip define out of disposals. WTF.
Showed that huge proc in /atom what polymorphism' is.
Now instead of huge condition line it's handled where it was supposed to be handled.
Added bloody footprints.
Updated changelog.
Merge branch 'bleeding-edge-freeze' of https://github.com/Baystation12/Baystation12 into whistle

Conflicts:
	baystation12.dme
Added this sound as emote to borgs.
Merge pull request #2937 from comma/armok

Armok
Merge pull request #2940 from comma/whistle

Whistle
Merge pull request #2939 from comma/surgery

Surgery
Merge branch 'bleeding-edge-freeze' of https://github.com/Baystation12/Baystation12 into organ

Conflicts:
	html/changelog.html