* Echo out protoc version
* Add protoc install bits to Makefile
* Get at least protoc 3.5
* Remove problematic bazel conflict files
* don't obscure the copying of generated files
* Attempt to debug differences
* Update generated proto files to match changes here
This PR removes the mixer/v1 bazel code for protoc-based generation, replacing it that logic with a Makefile.
Notes:
- generate-protos.sh is updated to call make targets
- all BUILD files were rewritten with gazelle to supply default targets around the generated files
- each of the .proto files is touched, as it is regenerated as part of this PR
Douglas Reid