v0.3

• You can now provide only an event ID and an FDSN server as input, in which case the time + location will be fetched from the FDSN event catalog.
• Fixed an issue where invalid inventory for a single station could cause the whole run to fail.
• Settings management now uses pydantic's BaseSettings, allowing configuration of all options via environment variables. Also moved some hardcoded constants into settings.
• Refactored everything to use a single internal representation of the calculation results, implemented as a pydantic schema for the output JSON.
• Implemented the missing maximum azimuthal gap quality check, and added unit tests for the azimuthal gap calculation routine.
• Added some more diagnostic logging for better insight into errors and quality control.
• General code cleanup and reorganization.