Console names do not allow _ char on some platforms

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Console names are limited to alphanumeric + '_'.
The addition of _ depends on adding it to the permitted characters using
wxTextValidator::AddCharIncludes("_");
This only became available in wxWidgets 3.1 and thus does not work on some current builds.
This is now added conditionally for builds with 3.1 or later.
_ can be used in the consoleName(newName) call.

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Resolved in wx2.5 versions.