Function rust_action_heroes::system::movement_solver::add_all_holding

fn add_all_holding(
    delta: &Position, 
    movables: &ReadStorage<Movable>, 
    positions: &ReadStorage<Position>, 
    holdings: &ReadStorage<Holding>, 
    entities: &Entities
) -> VecDeque<MovementEvent>

Geneartes a queue of all movaable entities in the "holding" state.