Expected properties extracted from plugin node info.
Hard coded exptected names removed.
Improved assert message if test fails.
Physics nodes tests added.
Static class global vars conveted to properties.
Long methods shortened by extracting methods.
Inspector property pane view building code moved to new class InspectorPropertyPaneBuilder.
Renamed PropertyInspectorHandler to PropertyInspectorTemplateHandler.
Moved PropertyInspectorTemplateHandler and related code to Inspector group.
InspectorController building inspector panes code moved to new class InspectorPropertyPaneBuilder.
InspectorPropertyPaneBuilder refactored: no longer works on code and item tab. Configured from outside.
Removed dependency to PropertyInspectorTemplateHandler, update triggered in InspectorController.