Refactored code to support local and external material sources
This is the first PR in a series to support external modules. External
modules allow materials to be stored in external data sources such as
databases or web services. No new functionality is introduced in this
PR, rather it is a refactoring of code that will allow for changes to
be introduced in future PRs. Minor performance improvements have also
been made in the model and material managers.
The Python API has been enhanced for many data types to allow for
modification within Python.
Dialogs to view the Appearance and Material properties of an object
These inspectors are intended to be used when debugging Appearance and
Material issues in a model.
The Appearance inspector displays the appearance properties of an
object. This will be more useful once PR 13792 is merged which migrates
parts to use ShapeAppearance instead of DiffuseColor. This shows each
of the appearance properties per face for the object.
The Material inspector shows the material, models, and properties
assigned to a model. It displays useful debugging information such as
the UUID and file paths associated with eacch of the items. This is
useful when finding and resolving model conflicts.
The material inspector now gives the option of copying the information
to the clipboard.
