littlefs-do: Generate list_settings.cpp from Settings.h

[NeroBurner]

Add and use the python script parse_infinitime_settings.py to generate the file list_settings.cpp with helper function list_settings() to reduce the maintenance burden by not having to manually handle changes in Settings.h.

Fixes: https://github.com/InfiniTimeOrg/InfiniSim/issues/54