3.0 circleci deb build

[tsaubergine]

Adds advanced Circle CI building with (all builds):

• Address Sanitizer
• Thread Sanitizer
• Undefined Behavior Sanitizer
• Clang static analysis (builds in 3.0 master):
• Ubuntu xenial and bionic package builds, and Debian package builds, with automatic uploads to packages.gobysoft.org "continuous" repo (builds with tags):
• uploads to packages.gobysoft.org "release" repo