Feature
* feat: add maxage option to spansh plugin
By specifying maxage, any station from the source that is older than the
age will be skipped.
So if a full update was done using galaxy_stations.json on 13th May
(which is updated every ~24 hours), doing a new update on 20th of May
with a max_age of 7 will skip anything in the source that wasn&39;t updated
later than 13th May ([`0063e12`](https://github.com/eyeonus/Trade-Dangerous/commit/0063e12d24fc72b5e2673a28956d5262371e8e8c))