Specify pause function in constructors of Animation if required, and remove the unused pause function from AnimationWithOffset.
Cleanup Animation.cs and reduce code duplication.
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.
