- blocking now reduces the taken damage
- projectiles now only collide once with each positionable, fixing #21
- particleswords are now relative to their source, fixing #19 but lost
their ability to destroy objects, as they don't have a proper collider.
This hast to be fixed over the course of solving issue 25
- projectiles are now generally produced by Actors, rather than
Movables, which just makes more sense
- longer delay between sword-strikes (300 -> 1000)