Editor: Selecting a sidebar item before base GTFS is fetched is glitchy

[landonreed]

When the editor loads, the base GTFS data is fetched for the feed being edited. If during this fetch a user attempts to click a sidebar item (e.g., clicking the 'routes' table), once the fetch is complete the table will essentially be deselected in a glitchy way. This typically only happens for large-ish feeds on slow connections.

We should disable these sidebar items if the base GTFS fetch has not completed to prevent this behavior.

[landonreed]

🎉 This issue has been resolved in version 4.1.0 🎉

The release is available on GitHub release

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