alpha release of fallback target logic gadget..

this gadget provides a toggle to allow units to:

⚪ default
direct attack target lost → do nothing (no new logic)

🟢 move
direct attack target lost → move to last known target position
original direct attack target found → direct attack original target

🔴 fight
direct attack target lost → fight order to last known target position
original direct attack target found → direct attack original target

🟣 attack ground
direct attack target lost → attack ground at last known target position
original direct attack target found → direct attack original target

this mod and all its code is now yours GoogleFrog.. i added the extra abilities as i think they have a use such as bertha loosing target might like attack ground option.. and fight option is nice for skirmishers as that was asked by someone else..

as a note none of these affect radar targets by design as there is no way of knowing what a radar target truly is without cheating

this has been tested now and works flawlessly from what i can tell and it has negligible impact on performance.. whats more its only 4kb