MCC TextEditor

By setting the readonly attribute to true the editor should keep all
functionality except the text should be readonly.

The biggest loss in functionality is the ability to select text and then
copy to the clipboard.

I know you can set an attribute to automatically copy the selection to the
clipboard but this is extremely impractical and unwieldy to use.

I suspect it is only really necessary to keep the bizarre autocopy mode if
enabled by the application. If not then a true readonly mode should be
used.

The current implementation is more akin to disabled than readonly.