Cleanup 0.4.1 migration code

After changing the app id, we needed to keep on shipping the old gschema file and enums, so that we can still access these settings, and can migrate settings to the new schema.

This happened in commit daaa10fc

One day in the future, when there's no more versions 0.4.1 or older in the wild, it will be nice to remove all of that cruft.

Station list file also moved from xdg config dir to xdg data dir.

This happened in 11d17408

Getting rid of that some time in the future will be nice.

Edited Nov 09, 2018 by Arnaud Rebillout

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