Idea catalogue: How to improve the hellaconfig.py module

We need a more fine-grained exception handling on load and save operations.

Improvements that will make it necessary to make changes in other parts of LottaNZB:

Don't log error messages directly using the logging facility, raise exceptions instead, which will be handled externally (sometimes LottaNZB just tests, if it's possible to load a HellaNZB configuration file. This will remove some odd and illogical error messages when setting up LottaNZB.

Don't load the HellaNZB configuration when loading the hellaconfig module. Trigger this from outside.