Merge branch 'qt_tree_control' of https://github.com/GeoTeric/wxWidgets into qt-fixes

See https://github.com/wxWidgets/wxWidgets/pull/1225

build/cmake/files.cmake

@@ -276,6 +276,14 @@ set(QT_HDR
     wx/qt/dataview.h
     wx/generic/activityindicator.h
     ${QT_PLATFORM_HDR}
+    wx/qt/treectrl.h
+    wx/qt/private/converter.h
+    wx/qt/private/winevent.h
+    wx/qt/private/timer.h
+    wx/qt/private/pointer.h
+    wx/qt/private/treeitemdelegate.h
+    wx/qt/private/treeitemfactory.h
+    wx/qt/private/utils.h
 )
 
 set(QT_SRC
@@ -374,6 +382,7 @@ set(QT_SRC
     src/qt/dataview.cpp
     src/qt/taskbar.cpp
     ${QT_PLATFORM_SRC}
+    src/qt/treectrl.cpp
 )
 
 set(MEDIA_QT_SRC