0.5.23: UI Cleanups/Improvements, Customizable Mesh Warping

0.5.23 is a regular monthly release that includes a variety of little UI cleanups, improvements to the mesh warper, and documentation for adding StationDefinedFrames to models.

Top-level summary:

• Parts of the model editing UI were cleaned up and a few nice-to-haves were added. Namely, the Add menu now has a search bar for searching through all available OpenSim components and the Add Component popup has a cleaner layout with nicer search functionality for sockets. The property editors and associated icons were also cleaned up and more clearly labelled.
• Features from the (currently, experimental) model warper were backported to the existing mesh warper workflow. E.g. you can now separately toggle scale/rotation/translation/warp and prescaling via the mesh warping UI.
• A documentation page for StationDefinedFrames were added to OSC's documentation. They are a prerequisite for creating models that can be scaled non-uniformly (documentation for the model warper is next on our list).

The release contains a variety of (other) changes (19 in total), which you can read in CHANGELOG.md.