Corrects an issue in the API where a new material may not have a UUID.
Corrected the test case to reflect the changes and better document the
process.
Added a test case for material filters.
Updates the material preferences including selecting a default material
Preferences adds some options for what gets displayed in the Materials editor.
The option to use the legacy editor is removed in favour of the new
editor.
A new preference page has been added that allows the user to select a
default material. This will then be assigned to any newly created object. In
support of this, a new widget PrefsMaterialTreeWidget has been added as an
extension of the MaterialTreeWidget to automatically save and restore the
selected material.
