Optimize CBA_targetWatch

[Kili-97]

Today we had an event with 56 players and we noticed that the TargetWatch variable generates unnecessary traffic.
We have calculated that over 3 hours that would be 230 MB of traffic. After an optimization it would be only 4MB traffic.

To improve: https://github.com/CBATeam/CBA_A3/blob/master/addons/diagnostic/XEH_preInit.sqf#L48

Player A would like to know target debug variable, but CBA sends them to ALL

Also it would be optimal to set the interval of the query as a global CBA setting.