AGW on Phoenix: fix wrong rendering of text colour for `CustomTreeCtrl` tree items and correctly cast sip pointers to ints to be able to draw nice panes in `wx.lib.agw.aui`.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75573 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775