Desnowflakes mechs, take 3 (actually functional edition) (#10014)

* Initial commit, only repaths

* oops, rename

* _mecha 1st pass

* /combat/ pass 1

* /mecha_equipment/ first pass

* medical_tools

* mining_tools first pass

* Mining_tools

* work_tools first pass

* weapons first pass

* mecha_actions first pass

* mecha_control & mecha_construct

* mecha_defense pass 1

* mecha_topic

* working

* odysseus

* conflict fixes

* BEGONE SLEEPS!!!

* fixes 2

* CONFLICT FREEEEE

* fix maps

* I think I inherited it right?

* tgstation/tgstation#53470

* hacky bs lmaooo

* fix bad cooldown

* add back ripley

* occupants

* 515

* guh

* remove backslashes

* retry

* tgstation/tgstation#53624

* tgstation/tgstation#54529

* prettier

* tgstation/tgstation#54454

* delete unused reference

* #10304

* update_appearance

* set mech weapons as firer to blacklist them from hitting themselves

* fixes mech z-fall & punch force & diagonal movement

* fix self-healing exploit