Previously the order that changes were made to blueprints was not being
saved. I worked around this by sorting by timestamp, but it only has 1s
resolution so it is very likely to end up with changes having the same
timestamp, especially when running tests.
This adds a new variable to the Store, it is a list of the commit hashes
for each blueprint, in the order they were made.
Since this is a change to the Store schema the first time the new code
is run with the old store state it needs to populate the commit list, as
best it can, with the existing data. To do that it sorts the changes for
each blueprint by timestamp and version and saves this ordering into the
new BlueprintsCommits list.
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