Replaced the run-test.sh script with a Python script that runs our unit
tests through pytest. Tests are now run in parallel to speed up running
the entire test suite, and it allows for integration with other tools
that support pytest, such as IDEs.
Also removed a dependency on remarshal, because it depends on an old
version of PyYAML that conflicts with other Python packages in our
Docker image. Replaced it with yq.
+ zmk,kscan_gpio_demux is now a compatible kscan option
+ kscan_gpio_demux is based heavily off of the implementation of
kscan_gpio_matrix, modified to address cols using an n-to-1
demultiplexer chip instead of discrete IO
+ Added zmk,kscan_gpio_demux.yaml file
* modified CMakeLists to include new source files
