Use '1'..'9' to simulate digits instead of WXK_NUMPADn.

Use '1'..'9' to simulate digits instead of WXK_NUMPADn.

Using WXK_NUMPADn with wxUIActionSimulator doesn't work under Unix, the
resulting GDK events have wrong keyval for some reason.

It would, of course, be nice to fix this but in the meanwhile use ASCII codes
to simulate the digits to at least allow doing this at all.

Also extend uiaction sample to allow testing text simulation.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69960 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775