When merged this pull request will:

• Fix Racks being broken for the Zeus Player when remote controlling AI in vehicles, which resolves Zeus - Exiting remote control while the AI character is inside a vehicle breaks racks and intercom #1267:
  It was caused by the sys_rack/fnc_rackPFH.sqf PFH being started when entering that AI and not terminated when exiting it, resulting in the PFH constantly disconnecting the player from his Racks. My fix works by limiting Rack initialization and PFH launch to only player units entering a vehicle, effectively preventing use of Racks by RCd AI entirely.
• Fix custom PTT assignments being reset when using a remote controlled unit's radios:
  A minor bug I encountered some time ago, happened because there was only a single DVAR(ACRE_ASSIGNED_PTT_RADIOS) that stored custom PTT assignments, when controlling a unit and using its radios sys_core/fnc_handleMultiPttKeyPress.sqf would check for the custom PTT radios to be present, not find them on the AI and reset the list. Now there are 2 DVARs to remember custom PTT assignments on the player and last controlled AI unit.