[Feature] Mobile Pipe Dispenser Lays Pipe

[UrsulaMejor]

since this seems to be a point of confusion, the mobile pipe dispenser is an already existing item in 2020 code that is just a child of the regular dispenser butv with anchored = 0 and a different sprite.

This patch isn't waiting for sprites or code or anything, it can be copy pasted directly into the code block for the existing mobile pipe dispenser