UI: Add grouping

UI/CMakeLists.txt

@@ -152,6 +152,7 @@ set(obs_SOURCES
 	window-log-reply.cpp
 	window-projector.cpp
 	window-remux.cpp
+	source-tree.cpp
 	properties-view.cpp
 	focus-list.cpp
 	menu-button.cpp
@@ -198,6 +199,7 @@ set(obs_HEADERS
 	window-log-reply.hpp
 	window-projector.hpp
 	window-remux.hpp
+	source-tree.hpp
 	properties-view.hpp
 	properties-view.moc.hpp
 	display-helpers.hpp
@@ -211,6 +213,7 @@ set(obs_HEADERS
 	visibility-checkbox.hpp
 	locked-checkbox.hpp
 	horizontal-scroll-area.hpp
+	expand-checkbox.hpp
 	vertical-scroll-area.hpp
 	visibility-item-widget.hpp
 	slider-absoluteset-style.hpp