Add planes to Objectmetry.

[Crayder]

Well my idea is to use hsep for X-axis distance, and vsep for Y-axis. I don't know however how I will go about the limits, since currently that's done using radius and degrees, in which neither would apply here.

I may just add a completely new dialog scheme for prisms (since the cylinders have this mostly covered it'll be mainly for rectangular prisms), planes, and other shapes such as pyramids and 2d shapes.

[Crayder]

I'm pretty sure I already did this, forgot about the issue.