Function elementalist::player::animation::set_casting_animation

pub(super) fn set_casting_animation(
    supplemental_state_next: ResMut<'_, NextState<PlayerAnimationSupplemental>>,
    er_cast_spell: EventReader<'_, '_, CastSpell>,
    frame: ResMut<'_, AnimationFrame>
)

Set the casting animation when spell casting event is triggered.