Improve specific listctrl wxQT, thanks @seandpagnier

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77935 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix listctrl base window pointer in wxQT, thanks @seandpagnier

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77936 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Allow setting font and brush in DC when the qt painter is not active in wxQT, thanks @seandpagnier

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77937 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775