Really add "hint" property to wxTextCtrl XRC handler schema description.

This was supposed to be done in r76628 but the property was mistakenly added
to wxRichTextCtrl instead.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76998 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Show "hint" wxTextCtrl attribute in the xrc sample.

Rearrange the contents of the wxTextCtrl page in two columns to make space for
the new control.

This should have been part of r76628 but was forgotten.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76999 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add a more complete example of different controls variants in XRC.

Add a dialog showing all the existing variants of a few common controls to
allow seeing at a glance how do they look.

See #16247.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77000 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775