1. generate the events from the event handlers, thus it is now possible to
process the splitter events in the parent window
2. when double clicking the splitter which can't be unsplit it doesn't jump
by a couple of pixels
3. misc code cleanup
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14263 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2. accelerators in the menus a la GTK (actually slightly better) implemented
3. wxSplitter now uses events (and so the code which was broken by recent changes
works again)
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2504 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
