Improvement in target validation.

Increased performance of target finder.

Previous versions when there is no more target around drones would stop and hover to owner.
Drones will now fly normally as they were doing in vanilla when returning back to the owner.
The above change won't affect drones aggressivity provided by the .lua.

Fixed a bug where the owner would be recognized as a valid target with the mod settings.
Fixed an issue where a single drone from a group would fail to return to its owner once there was no more targets in the vicinity.
Fixed an issue that would break logic in different FPS settings.

Improved performance in search conditions.

Removed from the search validation regarding target resistance.
- Unwanted behaviour where if there were few targets with priority tags between many other enemies would result in idle drones.