Add support for readonly constructor properties #22

Job	Run time
test (8.2, main, pgsql)	2m 36s
test (8.2, main, pgsql)	2m 35s
test (8.2, MOODLE_403_STABLE, pgsql)	2m 34s
test (8.2, MOODLE_402_STABLE, pgsql)	2m 30s
test (8.1, MOODLE_401_STABLE, pgsql)	2m 55s
test (8, MOODLE_400_STABLE, pgsql, xmlrpc-beta)	3m 26s
test (8, MOODLE_311_STABLE, pgsql, xmlrpc-beta)	2m 40s
test (7.4, MOODLE_310_STABLE, pgsql)	2m 31s
test (7.4, MOODLE_39_STABLE, pgsql)	2m 31s
test (7.4, MOODLE_38_STABLE, pgsql)	2m 28s
test (7.3, MOODLE_37_STABLE, pgsql, ^3)	2m 19s
test (8.1, main, pgsql)	2m 39s
test (8.1, main, pgsql)	2m 36s
test (8, MOODLE_403_STABLE, pgsql)	2m 29s
test (8, MOODLE_402_STABLE, pgsql)	2m 27s
test (7.4, MOODLE_401_STABLE, pgsql)	2m 53s
test (7.3, MOODLE_400_STABLE, pgsql, ^3)	3m 6s
test (7.3, MOODLE_311_STABLE, pgsql, ^3)	2m 32s
test (7.2, MOODLE_310_STABLE, pgsql, ^3)	2m 41s
test (7.2, MOODLE_39_STABLE, pgsql, ^3)	2m 39s
	53m 7s

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