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.
- Adds the ability to construct Syndicate Medbots, which were previously
in the code but unable to be constructed. These bots will only heal
Syndicate Nukeops, and can only be made from the medikit box that
Nukeops can purchase.
- Fixed recharging in energy crossbows and laser tag guns, they were
recharging 10x slower than they were meant to.