Group Manager Update

Updated and bug fixed Group Manager

[Fixed] camera reverting to boarding area when hitting tactical view key
in a vehicle thanks @cen for reporting
[Added] message to inform user if the selected player is already in a
group. User is also notified if he or she is not the leader and can not
send invites
[Fixed] removed blufor icon since all players are on the same side in
DayZ
[Added] updated OP directions to make right click on radio the default
method, right ctrl hotkey is optional
[Fixed] updated OP directions for infistar AH334D
[Fixed] updated infistar ESP function to latest version and added
distance and vehicle tags to group leader