Add make all command

[dmathieu]

There are a lot of different make commands in this project, and as I was updating the proto definitions, I ended up having to use many of them (generate-modelpb, update-licenses, fmt for a proto update).
So this make all command is a utility tool to make it easier to regenerate and clean up everything.

[axw]

Thank you! Maybe later we can add some finer-grained dependencies between tasks, so running "make generate-modelpb" would also add license headers and format the code, without also running fieldalignment and gomodtidy. This is good enough for now though.