Add support for readonly constructor properties #245

Job	Run time
test (8.3, main, pgsql)	2m 32s
test (8.3, main, pgsql)	2m 32s
test (8.2, MOODLE_403_STABLE, pgsql)	2m 40s
test (8.2, MOODLE_402_STABLE, pgsql)	2m 19s
test (8.1, MOODLE_401_STABLE, pgsql)	2m 53s
test (8, MOODLE_400_STABLE, pgsql, xmlrpc-beta)	2m 53s
test (8, MOODLE_311_STABLE, pgsql, xmlrpc-beta)	2m 50s
test (7.4, MOODLE_310_STABLE, pgsql)	2m 28s
test (7.4, MOODLE_39_STABLE, pgsql)	2m 18s
test (7.4, MOODLE_38_STABLE, pgsql)	2m 26s
test (7.3, MOODLE_37_STABLE, pgsql, ^3)	2m 13s
test (8.1, main, pgsql)	2m 43s
test (8.1, main, pgsql)	2m 43s
test (8, MOODLE_403_STABLE, pgsql)	2m 43s
test (8, MOODLE_402_STABLE, pgsql)	2m 26s
test (7.4, MOODLE_401_STABLE, pgsql)	2m 55s
test (7.3, MOODLE_400_STABLE, pgsql, ^3)	2m 48s
test (7.3, MOODLE_311_STABLE, pgsql, ^3)	2m 42s
test (7.2, MOODLE_310_STABLE, pgsql, ^3)	2m 56s
test (7.2, MOODLE_39_STABLE, pgsql, ^3)	2m 39s
	52m 39s

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