Add toggle to air plants, "force bombers to hold fire/position"

Description

Next to the button to set only fighters to patrol, add a button to prevent bombers from attacking units without an input by the player. This is done generally with a combination of hold fire + hold position.

see: https://github.com/beyond-all-reason/Beyond-All-Reason/pull/6605#issuecomment-3735307677

Why?

This change sets a more reasonable default state, but also makes it easy to toggle that state. StatePrefs can override this as wanted to keep the original behavior and etc.

Players rarely want their bombers to autotarget random, mobile units. These are generally raiders inside of their own base.

They could want an air lab to spam bombers continuously. This change would enable toggling that behavior easily.