Removing href-tags from log_game in transfer_valve.dm

Not sure I'm doing this the best way, but I couldn't come up with a cleaner way. Suggestions are welcome!
Removing hrefs from log_game in chem_grenade.dm

Fixes #2333
Removing hrefs from log_game in ghettobomb.dm

Fixes #2333
ops
Mineral doors won't close anymore if there's a mob under them. Even a butterfly.
Mineral doors will now update the air when closing and opening. No more magic air shields from here.
Merge branch 'master' of https://github.com/tgstation/-tg-station
Implement an preattack override for your self contained snowflake needs
Remove adjenct check from click,and move it after attack self
Fixed https://github.com/tgstation/-tg-station/issues/761
Standardizes and cleans up objective.dm
Converts Steal objectives (except for blueprints grr) to a datum-based system. This is to support further changes to the objective system, though it does make adding new objectives nice, simple and compartmentalized.
Completes code changes; reimplements ninja steal objective.
Merge branch 'master' of https://github.com/tgstation/-tg-station into objectives
Gets rid of a couple colons.
Fixes #2553 and #2533

Fixes the away map dead slime spawner. Previously, it would spawn two
dead slimes that had living icons. Now it spawns one slime with a dead
icon.  These issues are fixed by adding a check for existing slimes at
the spawner's location before spawning a slime, and killing the spawned
slime via adjustToxLoss() instead of death(). Death() doesn't give the
slime a dead icon for some reason.

Fixes the away map dead AI spawner. Previously, it spawned a dead AI
that showed on the PDA messenger from roundstart, made the AI status
displays on the station show the BSoD, and displayed its laws in the
round-end report. These issues are fixed by setting the spawned AI's PDA
toggle to 1, changing the status displays back to blank after the AI
dies and removing the dead AI from the moblist so it isn't shown at the
end of the game.
Merge branch 'master' of https://github.com/tgstation/-tg-station
Various Bugfixes
Fixes #2534
Fixes #2431
Fixes #2493
Fixes #2500
Changes the returns around for facehuggers to be inclusionary return 1 instead of exclusionary return 0
Makes badminbombs delete after detonating
Fixed issue #2432. Also fixed for ED209 (had the same issue).
Secbots will not longer arrest people through obstacles