Tears apart the overloaded `/obj/item/mecha_parts` into a few different
paths.
`/obj/item/vehicle_chassis` for the base part that things attach on
(this is the mech construction holder)
`/obj/item/vehicle_part` for things you attach to chassis
`/obj/item/vehicle_component` for integral components
`/obj/item/vehicle_module` for equipment
This is to prepare for further work on mecha as a system, and to get
some of the massive line changes out of the way.
Also:
- tears apart a few files that were just too long to be handled and
groups everything with their mechs
- erases some code reuse
* dme and dmb
* Heeeere we gooo
* fasease
* Continued.
* AAAAAAAAAAAAAAAAAAAAAAAA
* Brain going numb
* agh
* The suffering will be worth it... right?
* Going blank...
* Am I done?
* AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
* Fixes
* Should be everything I care about right now.
