Finish removing Ring dependency #934

Job	Run time
build_and_test (components/integration-tests)	3m 23s
build_and_test (components/uid-mux)	1m 48s
build_and_test (components/actors/actor-ot)	2m 27s
build_and_test (components/cipher)	2m 47s
build_and_test (components/universal-hash)	3m 6s
build_and_test (components/aead)	2m 47s
build_and_test (components/key-exchange)	3m 24s
build_and_test (components/point-addition)	2m 25s
build_and_test (components/prf)	2m 52s
build_and_test (components/tls)	4m 9s
build_and_test (tlsn)	4m 24s
	33m 32s

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