[suggestion] Air-Springs

[Ruedii]

It would be nice to have air springs in some of the piston and hinge parts.

These would not use electricity to maintain their position (unlike actuators) but could only be set to one position.

However, pushed out of position they would give a specified amount and return with a specified amount of force.  This would make them really good for giant landing legs.

Additionally, there should be an option on some of the larger parts to "lock to air spring."  This would temporarily turn it into an air-spring with the target point of the current position (NOT current target, which could be abused).