Support for sequences

[vcabbage]

Unsure how widely used sequences are. Low on the priority list unless someone asks for them.

amqp/types.go

Lines 1710 to 1712 in ee6eb7e

	// TODO: this could be data(s), amqp-sequence(s), amqp-value rather than single data:
	// "The body consists of one of the following three choices: one or more data
	// sections, one or more amqp-sequence sections, or a single amqp-value section."