Basically reverts 186de76d95
The OkHttp backend sometimes causes issues when servers cut the connection.
We had this happen after 1000s (about 17 minutes) for many users after upgrading OkHttp.
Removes proxy support for streaming.
When the position saver ticks while the service is just about to be
stopped, it might happen that we first reset the position and then
set it to the end again. This works around this.
- Run Checkstyle with gradle to make it easier for users
- No longer needs different configuration for new code
- Exclude current violations
- Fix some violations that somehow couldn't be specified in the exclusion file
- Print SpotBugs/Lint/Checkstly violations in GitHub format
- Then the CI run gets annotated on the web UI
