A port of https://github.com/d3athrow/vgstation13/pull/4377

Allows brooms to be wielded with 2-hands. Doing so places the broom
between your legs so you look like you are riding it.
You can also put a horsehead mask onto the broom to create a stick-horse
to ride. This can also be wielded, but will ALWAYS appear between your
legs.
And for the more magically inclined, wielding a broom or stick-horse (2
hands!) will cause you to ride it like a witch, giving you the ability
to bypass hazards such as tables and banana peels.
- Death Commandos now actually use the Death Commando frequency.
- Death Commandos have had their medical kits replaced with nanite
hyposprays.
- CentComm officers now spawn with a pulse pistol on their belt as
opposed to the useless base parent egun they got before.
- Remove the NT Rep equip option, as it's already available under the
'as job..' option.
- Merge the Spec Ops and Death Squad officer equip option
- Fixes the madmin malt's hellwater having the wrong ID.
-Removing the Hawke snowflake gear from the select equipment list
-Only -roles- should be added, not your personal gear.
-Fixing up the ID's so they actually show the job on the ID card name
also
-Adding singuloth knights.
Fix adminbus toggling genes on to cause all other genes to manifest - added genemutcheck proc and domutation proc to handle the changes.
Added a global list of gene datums that match the order of the randomized blocks in genetics to allow for easy lookup based on blocks and allows single gene checking to work.
Conflicts:
code/game/gamemodes/setupgame.dm
code/modules/admin/verbs/debug.dm