Motivation:
The terminology used with inbound/outbound is a little confusing since
it's not discussed in the spec. We should switch to using local/remote
instead. Also there is some asymmetry between the inbound/outbound
interfaces which could probably be cleaned up.
Modifications:
Changing the interface names and making a common Http2FlowController
interface for most of the methods.
Result:
The HTTP/2 flow control interfaces should be more clear.
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