Proto commits in google/vxsig

These 5 commits are when the Protocol Buffers files have changed:

Commit:2f25afb
Author:Christian Blichmann

Update metadata, HTTPS in license headers

The documentation is generated from this commit.

Commit:0435624
Author:Christian Blichmann
Committer:Christian Blichmann

Update dependencies - Abseil - Protobuf - GoogleTest Also update copyright in a few places Signed-off-by: Christian Blichmann <cblichmann@google.com>

Commit:0dc129e
Author:Christian Blichmann
Committer:Christian Blichmann

Better names for function filter constants This uses function inclusion/exclusion instead of white-/blacklist. Signed-off-by: Christian Blichmann <cblichmann@google.com>

Commit:a67d77b
Author:Christian Blichmann

Update license header with recommended best practices Signed-off-by: Christian Blichmann <mail@blichmann.eu>

Commit:2b1ab6a
Author:Christian Blichmann

VxSig OSS release. Signed-off-by: Christian Blichmann <cblichmann@google.com>