Add support for readonly constructor properties #244

Job	Run time
test (8.3, main, pgsql)	2m 28s
test (8.3, main, pgsql)	2m 40s
test (8.2, MOODLE_403_STABLE, pgsql)	2m 26s
test (8.2, MOODLE_402_STABLE, pgsql)	2m 30s
test (8.1, MOODLE_401_STABLE, pgsql)	2m 52s
test (8, MOODLE_400_STABLE, pgsql, xmlrpc-beta)	3m 19s
test (8, MOODLE_311_STABLE, pgsql, xmlrpc-beta)	2m 47s
test (7.4, MOODLE_310_STABLE, pgsql)	2m 33s
test (7.4, MOODLE_39_STABLE, pgsql)	2m 34s
test (7.4, MOODLE_38_STABLE, pgsql)	2m 27s
test (7.3, MOODLE_37_STABLE, pgsql, ^3)	2m 12s
test (8.1, main, pgsql)	2m 19s
test (8.1, main, pgsql)	2m 40s
test (8, MOODLE_403_STABLE, pgsql)	2m 41s
test (8, MOODLE_402_STABLE, pgsql)	2m 31s
test (7.4, MOODLE_401_STABLE, pgsql)	2m 42s
test (7.3, MOODLE_400_STABLE, pgsql, ^3)	3m 12s
test (7.3, MOODLE_311_STABLE, pgsql, ^3)	2m 39s
test (7.2, MOODLE_310_STABLE, pgsql, ^3)	2m 48s
test (7.2, MOODLE_39_STABLE, pgsql, ^3)	2m 29s
	52m 49s

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