* Remove templates
* Update appveyor configs
* Deduplicate os:linux from travis
* Add more configs to travis
* Add clang-9
* Fix failure of codecov job
* Move template readme
* Move VS 2013 test (older do not support 64bit)
Enable AppVeyor, Azure Pipelines and Travis CI for self.
Add test/ with basic health checks to be run on supported CI-s.
Add fake library header for depinst.py.
Disable codecov.io for boost-ci self-check on Travis CI.
Requires change in #35