Change-Id: I3470e0b2e978221aa0c1e46a4b65f71f71abef2e
We have a number of integers with variable-length encoding, so add a Construct for this. Naming inspired by GreedyBytes. Related to https://github.com/construct/construct/issues/962 Change-Id: Ic6049b74ea3705fda24855f34b4a1d5f2c9327f7