Add new config property: CONFIG_MODE

[skip ci] Upgrade gradlew to 6.1.1

Bump protoc from 3.10.0 to 3.11.2 (fossable#224)

Bumps [protoc](https://github.com/protocolbuffers/protobuf) from 3.10.0 to 3.11.2.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.10.0...v3.11.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

[skip ci] Update group control panel

[lockstone] Implement direct login

[skip ci] Fix two publishing errors

Fix JavaDoc error and publish stream module

Implement ThreadStore shutdown hook

Add release plugin