Use etags-goto-tag-location in etags xref backend
* progmodes/etags.el (xref-etags-location): New class. (xref-make-etags-location): New function. (etags--xref-find-definitions): Use it. (xref-location-marker): New method implementation. * lisp/progmodes/xref.el: Mention that xref-location is an EIEIO class.
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