Ling sting usability improvement

Tested - it works
Replaces the different sleep() calls from the slime reactions for spawn() calls. Now you can't inject the same reagent into different cores generating runtimes.
Standarized some of the code of slime reactions, hopefully they won't be creating issues.
Removed the plasma bluespace slime reaction. It was so bad. SO BAD.
Fixing aifixer
Merge branch 'master' of https://github.com/tgstation/-tg-station into SlimeReactions

Conflicts:
	code/modules/reagents/Chemistry-Recipes.dm
Merge pull request #2875 from Aranclanos/SlimeReactions

Slime reaction fixes.
removes my fucks ups, Chemistry-Recipes.dm is standardized now (again) and the weedkiller and pestkiller chemical reactions are added back.
Merge pull request #2952 from Aranclanos/ChemistryRecipes

chemistry recipes fuck ups
Merge branch 'master' of https://github.com/tgstation/-tg-station into LingSting
Merge conflicts a bitch
Merge pull request #2750 from Razharas/LingSting

Ling sting usability improvement
Merge pull request #2941 from Razharas/AtmosMagic

Fixing aifixer