cupcakes melee experiments

melee test bed

currently implements:-

- A basic "parry": from the start of a melee attack to the point at which it connects, you are immune to all damage. Currently somewhat overpowered due to this being just a test; in future it will be restricted to only affect melee damage (maybe). 

- Adjustment to melee animations: they now run at ~2/3 speed to give more reaction time to recipients. Probably needs tweaking to adjust each melee animation individually for balance.