Ability invoker
A base component
which is required for casting abilities. This component
handles the general flow of casting abilities, i.e. triggering the different stages at the correct timings.
Only one Invoker is required per GameObject-hierarchy (caster).
Default projectile spawn
If you set a transform here, this transform will be set as projectile spawn for all projectile abilities you add to this caster.
Note that you can always change spawn point per projectile ability later.