Powder Game 2 ver5.7

[IvanYiu247]

Joint now has rotation function.
The option is selected by clicking the Joint option multiple times, which rotates in the following order:
N, Left, Right, N...

N creates Joints without rotation.
Left and Right creates Joints which rotates anticlockwise/clockwise.

Now we don't need soapy + element for spinning Joints.

[Qwerty]

Ah, this should be sweet for robots or whatever we're calling them. Much easier wheels.