Enabled firing multiple armaments at a target simultaneously.
Each armament defines own cursor for targeting.
The force attack modifier influences armament choice for target.
Autotargeting modified to handle firing multiple armaments simultaneously.
As a consequence, healers (medics) no longer require separate Heal
activity and AttackMedic and AutoHeal traits.
ISync is implemented by AttackBase, so there's no need for other Attack traits to implement it again.
AttackTurreted inherits AttackFollow, which already implements ITick.
