Re-factoring of gov convoy logic into functions, and re-factoring of admin functions

- New camera implementation form scratch to replace older buggy version
  * W,A,S,D keys to move around at regular speed
  * Shift + (W,A,S,D) to move around at higher speed
  * Shift + Next / Previous channel to switch around camera target
  * Shift + Chat key to enter detached mode
  * N Key for cycling to night vision, and various thermal modes
  * HeliUp, and HeliDown  (Throttle Up/Down) keys for adjusting Z axis relative to camera
  * Mouse Wheel Up/Down for granular camera speed adjustments (without shift)
  * Map key and click on map for setting camera position to desired location on map
- Reorganized the convoy functions into functions so that it's easier to understand, and maintain. 
  * Logic added by Otavio, and convoy messaging system  is still the same, just moved around somewhat
- Added some improvements to the name tags drawing logic for vehicles
  * Tags are not drawn anymore while player is inside a vehicle
  * When aiming at a player who is inside a vehicle, tag is drawn slightly above the engine