Add partial(flash) blocks support (#718)

add changelog info for partialblocks-release

fix GUI when setting startBlock to a negative value: will now automat…

…ically revert stopBlock to 0 instead of failing to keep previous behavior

fix gui handling of build command, relative stop block loading in oth…

…er sinks

bump changelog

fix protogen on imported modules not referenced

First migration guide for moving from `substreams-sink` to `substream…

…s/sink`

prepare release v1.17.0

prep release, changelog

bump changelog