* Convert to gradle 7.
* More fixes, regenerated lockfiles.
* Update lockfiles for dependency update.
* Fix show_upgrade_diff for new lockfile format
* Add property for allowInsecureProtocol
Allow us to override the restriction against use of plain HTTP for
communication to dependency repositories. We need this to be able to use a
local proxy for dependency gathering.
* Checking in missing gradle.lockfile
* Resurrect symmetric vkeys when possible.
AbstractVKeyConverter had never been updated to generate symmetric VKeys for
simple (i.e. non-composite) VKey types. Update it to default to generating a
VKey with a simple Ofy key.
With this change, composite VKeys must specify the "compositeKey = true" field
in the With*VKey annotations. Doing so creates an asymmetric (SQL only) VKey
that can triggers higher-level logic to generate a corrected VKey containing
the composite Key.
