init.sqf:
briefing.sqf is launched as f_script_briefing

f_orbatNotes
- now waits for f_script_briefing to be done before adding Orbat Note section (under rest of of briefing)
- removed marker functionality (broken due to different handling of GroupNames in A3)

f_nametags:
- doesn't display 0/0 cargo seats for vehicles without cargo anymore
- adds a section to the briefing to inform users about name tag availability
- users can rebind name tag toggle key via a hotlink in the briefing