Material: MaterialTreeWidget usability enhancements

Improves the MaterialTreeWidget beyond minimum viable product.

- Filters can now be filter lists to allow a variety of filtering
	options.
- User preferences allow the inclusion/exclusion of favorites and
	recents.
- Widget state such as expansion, tree expansions, etc are saved and
	restored.
- show current appearancee material when editing.
- implements a python interface

#fixes 13421: always opens full tree

src/Mod/Material/App/MaterialManager.cpp

@@ -24,6 +24,7 @@
 #include <random>
 #endif
 
+#include <QMutex>
 #include <QDirIterator>
 #include <QMutexLocker>