Morgue Changes

Crematorium lights up when cooking.
Morgue slabs change light color depending on what is inside.
Red = dead body, orange = no body but items, green = client connected
body.
Updates when open or closed, and when ghosts/re-enters body inside.
Genocide of the Colons
Whoops
Forgot Crematorium Changes - Whoops
Merge branch 'Morgue-Changes' of https://github.com/ChuckTheSheep/-tg-station into Morgue-Changes
Moved on_login() now named on_log()
Fixes regarding path case
Made the Login/out()s involved under mob
Moved Login/Logout to their defined files
Whoops
Cleans up the for() and list handling in update.
Changelog updated.
Merge pull request #2242 from ChuckTheSheep/Morgue-Changes

Morgue Changes
Updated the changelog to include https://github.com/tgstation/-tg-station/pull/2242
Merge pull request #2298 from Giacom/changelog_enter_number_here

Changelog updated. Insta-merge please.
Issues fixing

Added biogenerator and freezer/heater
Fixed issues gia pointed out
Added some lost sprites
Merge branch 'master' of https://github.com/tgstation/-tg-station into SayYiffYiffIfYouAreMachineFucker