extensions: randr: fix RR-GET-OUTPUT-INFO indices #172
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The CRTC-START index was incorrect, which caused RR-GET-OUTPUT-INFO to return bogus CRTCs, modes, clones, and name.
Additionally, document the function's multiple return values and declaim its type. The latter required adding some types and adjusting some existing types and constants.
Finally, reindent RR-GET-OUTPUT-INFO, wrap some overlong lines, and clean up some comments and whitespace.