GitLab

Added setup()/loop() functions back to *_main.cc files to support compiling in CI.  Future features could enable this for the end user.

Improved flexibility by removing the Arduino entry points in favor of manual calls to setup/loop that the user can call from their entry point.  This is the more common use case for Arudino.

Also added the gtest/gmock_main files to the PlatformIO ignore list since we are not supporting that feature.

Comments changes, no functionality changes

Formatting changes,small cleanup,  no functionality changes