As mentioned in the comment in comictaggerlib/main.py:186
The default value should be None not the empty string.
We also check if the given value is the default or the empty string and
the setting is unset so the default value is not saved in the settings
file.
The default_api_url is shown in the GUI Settings Window it is not
currently show in the cli help.
Make "runtime" a persistent group, allows normalizing without losing validation
Simplify archiver setting generation
Generate options for setting a url and key for all talkers
Return validated talker settings
Require that the talker id must match the entry point name
Add api_url and api_key as default attributes on talkers
Add default handling of api_url and api_key to register_settings
Update settngs to 0.6.2 to be able to add settings to a group and
use the display_name attribute
Error if no talkers are loaded
Update talker entry point to comictagger.talker
