Move to composer based deps #297

Job	Run time
test (8.2, master, pgsql)	4m 55s
test (8.2, master, mariadb)	4m 48s
test (8.2, MOODLE_402_STABLE, pgsql)	5m 5s
test (8.1, MOODLE_401_STABLE, pgsql)	5m 29s
test (8, MOODLE_400_STABLE, pgsql, xmlrpc-beta)	7m 6s
test (8, MOODLE_311_STABLE, pgsql, xmlrpc-beta)	5m 8s
test (7.4, MOODLE_310_STABLE, pgsql)	4m 39s
test (7.4, MOODLE_39_STABLE, pgsql)	6m 56s
test (7.4, MOODLE_38_STABLE, pgsql)	4m 47s
test (8, master, pgsql)	6m 47s
test (8, master, mariadb)	4m 54s
test (8, MOODLE_402_STABLE, pgsql)	4m 46s
test (7.4, MOODLE_401_STABLE, pgsql)	5m 21s
	1h 10m 41s

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