core: Add broadcast control channel definitions to messages.h.
core: Add broadcast control channel definitions to messages.h.

ketoo/Astron,ketoo/Astron,pizcogirl/Astron,ketoo/Astron,blindsighttf2/Astron,pizcogirl/Astron,pizcogirl/Astron,pizcogirl/Astron,ketoo/Astron,blindsighttf2/Astron,blindsighttf2/Astron,blindsighttf2/Astron