Minor updates and fixes

- fixed: disabled some globalChat debug messages (//)
- fixed: spectator log file error messages
- added: 1st person spectator support (including 'auto combat focus')
- added: set spectator focus to last selected group on MCC map (so after
selecting icon, open spectator will focus on the selected group leader)
- update: 500m increment to viewdistance setting
- fixed: after HALO jump backpack on pelvis was not removed
- update: improved check if zone exists before spawning AI units
- update: added more heli door open/close options