Fixes and improvements to the CI pipelines.
- Custom fixes to coala: support python3.8 and recent versions of cppcheck
- Adapt .coafile to current coala
- Adapt LicenseYearBear to current svn python package
- Move the linter configuration to the coala directory
- Remove the now unused lint-patch script
- Update Jenkins pipelines to report build stderr as a comment on Unix (including warnings when the build succeeds), and to report lint issues inline
Tested on Jenkins during the past week.
Differential Revision: https://code.wildfiregames.com/D2931