Continues the work of the material subsystem improvements.
This merge covers the continued development of the material editor. The
primary improvements are in the handling of 2D and 3D array properties.
These properties are now fully editable, and can be saved and restored.
The cards now separate the author and license. These were previously
saved as a single item. Future support will be provided for standard
open source licenses.
Saving operations validate the cards to ensure UUIDs of materials are
considered. Warnings are given when a save could potentially impact the
models, such as saving over a material instead of creating a new
instance.
The editor is still not complete. There are a number of functional
elements, such as drag/drop operations, folder creation, and deletion
operations that need to be added to the main tree. State needs to be
saved and restored to improve the user experience. The appearance
preview also needs significant work. This will be handled in a future
PR.
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