Add scratch marker reader macro #164

Job	Run time
ci-config	1s
report-warnings [lisp=abcl]	1m 41s
tests [lisp=abcl]	1m 40s
report-warnings [lisp=allegro]	2m 58s
tests [lisp=allegro]	2m 13s
tests [lisp=ccl]	57m 5s
tests [lisp=cmucl]	1m 3s
report-warnings [lisp=ccl]	56m 58s
tests [lisp=ecl]	2m 24s
report-warnings [lisp=cmucl]	57s
tests [lisp=sbcl-bin/2.1.10]	1m 38s
report-warnings [lisp=ecl]	2m 31s
report-warnings [lisp=sbcl-bin/2.1.10]	1m 41s
	2h 12m 50s

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