Merge branch 'reset_chargen' into 'master'

Reset mCharGen along with the other MyGUI-holding members

Closes #7078

See merge request OpenMW/openmw!2533

apps/openmw/mwgui/windowmanagerimp.cpp

@@ -546,6 +546,7 @@ namespace MWGui
             mWindows.clear();
             mMessageBoxManager.reset();
             mToolTips.reset();
+            mCharGen.reset();
 
             mKeyboardNavigation.reset();