Add missing wxPropertyGridManager events

[rossanoparis]

With the current version of wxUI only two events are available for wxPropertyGridManager widget

Could it be possible to add even the others?

[KeyWorksRW]

https://docs.wxwidgets.org/3.2.0/classwx_property_grid_event.html lists the events and descriptions as a starting point. I don't think there are any new ones for wxWidgets 3.3, but that should be checked.

[Randalphwa]

C++ events added for both wxPropertyGrid and wxPropertyGridManager. wxPython doesn't support some of these events, so that will need additional work. wxRuby3 needs to wait until I can get a working version again.

[Randalphwa]

There was a bug in Ruby code generation that prevented verifying that propertygrid events were being correctly generated for wxRuby3. That has been fixed with the correct code checked into wxUiTesting.