AGW on Phoenix: apply patches from Werner to avoid `PyDeadObjectErrors` in the `persist` module and to bypass wx.lib.sized_controls in AUI.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73536 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
AGW on Phoenix: use `wx.Bitmap.ConvertToDisabled` to generate dimmed/disabled bitmaps for AUI purposes.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73538 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Phoenix: add the grid overview to the index.rst file.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73539 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775