Support User Accessible Configuration

[sanssecours]

Description

Currently changing the configuration (mainly used for “hardware” tests) requires editing a YAML config file located inside the package. While this might be okay, when we clone the repository and use pip -e (editable source) to install the package it is certainly less from ideal:

• We need to be aware where the package (config file) is stored on our machine
• If we use pip without the -e option the config file might be stored inside an archive or another location that is hard to access

For that reason and as preparation for uploading the package to PyPI we should make it possible to store the configuration at a location that is easier to access.

ToDo

• [x] Read documentation from repo, site (global) and user config
• [x] Add CLI tool to open (and create) config files
• [x] Validate configuration (to make sure we do not store incorrect values)
• [x] Fix configuration values that depend on repo location
  • [x] Path to firmware
  • [x] Path to log files
• [x] Change all configuration keys to lowercase
• [x] Update default values, if it makes sense
• [x] Update documentation