BROADCASTER REWORK AHOY (also powernet things)
- Added: /datum/power_connection components, allows machinery to have cable connections without being /obj/machinery/power + more flexibility
- Bugfix: Broadcaster doesn't use area power anymore, requires a direct cable connection to grid.
- Bugfix: Broadcaster can be unwrenched again
- Bugfix: Broadcaster cannot be on while unanchored
NOTE: Didn't fuck around with adding cables to the broadcaster's lair on the maps. Mappers will need to fix that.
Tested locally, eradicated some related funtimes.