Use a hash set instead of vector to hold dedicated keys in wxPG.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78173 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix using compatibility flag in propgridpagestate.h header file.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78174 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Use Boolean variable to store Boolean values in wxPG.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78175 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775