Add tuple and CompactBytesArray decoding

[frozeman]

Should be able to decode valueType and valueContent of tuples:

(bytes4,address,bytes4) results in -> ["0x11223344", "0x1122334411223344112233441122334411223344", "0x11223344"]

CompactBytesArray:
first byte length of bytes l, followed by bytes, follo3ed by length of next bytes.
valueContent = "CompactBytesArray"
"0x04112233441411223344112233441122334411223344112233440411223344" in
-> ["0x11223344", "0x1122334411223344112233441122334411223344", "0x11223344"]

Should also work:
(Bytes4,Address,Bytes4)[] // ABI encoded array of a tuple
(Bytes4,Address,Bytes4)[CompactBytesArray] // CompactBytesArray encoded tuple (cheaper)

[Hugoo]

Closed in #261