Add support for editing `GeometryPath` _wraps_ in the `GeometryPath` property editor

[adamkewley]

Estimate: 1-2d

• @AdrianHendrik reported that they can't create a OpenSim::PathSpring because it requires creating a GeometryPath with >= 2 points (#645)
• So a GeometryPath editor was hastily integrated in a day or two that enables editing the points (#522)
• Which also fixed not being able to add certain components that require two geometry points (e.g. #518)
• But a further enhancement would be to enable users to assocate WrapObjects in the model (these are typically attached to bodies) with GeometryPaths (this issue)

This was broken out into a separate issue because the bare-minimum of providing some way of editing a GeometryPath minimally such that users can add (e.g.) PathSprings into a model was fixed in #645/#522. This issue is technically an enhancement of that, because I am guessing that the user in question also wants to add wrapping objects to the path.