Implement compiled file loading.

* eval.c (load): If open_txr_file indicates compiled file by
setting txr_lisp_p to character #\o, use read_compiled_file.

* match.c (v_load): Likewise.

* parser.c (open_txr_file): Recognize the .tlo suffix, and
also try to open a .tlo version of an unsuffixed file before
trying it as .tl. Indicate a .tlo file by setting txr_lisp_p
to the character #\o rather than t.
(read_file_common): New static function, made from contents of
read_eval_stream. Will either evaluate forms or load compiled
code by instantiating virtual machine descriptions and
performing their top-level execution.
(read_eval_stream): Now a wrapper for read_file_common.
(read_compiled_file): New function.

* parser.h (read_compiled_file): Declared.

* txr.c (help): List new --compiled option.
(txr_main): If --compiled is specified, set txr_lisp_p to #\o
to load as compiled code. Update error message that -c is
not compatible with --lisp or --compiled.
If txr_lisp_p is #\o, then use read_compiled_file.

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