We previously had three different places where the sliderule system was build: the root makefile, the slideruleearth-aws makefile, and the dockerfile. This led to unnecessary coordination between the three places and also some inconsistencies in the way the code was built.

The goal is to have only one place where the code is built - the slideruleearth-aws makefile.

Changes:

• Removed plugin builds from root makefile
• Removed ENABLE_COMPAT option that supported CentOS 7
• Standardize on C++17 for all plugins
• GitHub workflow for selftest uses the slideruleearth-aws build
• Captured build dependencies in a lock file
• Added pistache, clang, cppcheck to the build environment
• Selftest GitHub workflow runs address sanitizer - removed valgrind from workflows
• Made unit tests in C++ code conditional on debug build
• Added a target that uses atlas plugin so that we can verify that it builds and runs