* [presubmit] Enforce language attribute in projectt.yaml to be always set.
* Update documentation, better presubmit check, new project template.
* add docstring to templates.py
* Add example values in the project.yaml template and remove python value for now
* Add "project: c++" to 256 projects
* format
* Add labels and selective_unpack sections to the presubmit check
* fix incorrect auto_ccs format in three projects
* fix nss emails after rebase
1. Ensure targets are re-linked after re-compiling libfuzzer_entry.o
2. Don't rely on LIBS to link libfuzzer_entry.o correctly (cannot
reproduce bot build failure, but log suggests this is the issue).
devtty1er