Adds ability to delete all connections

[ncordon]

Adds an icon and command to delete all connections (similar to what we have for parameters):

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Latest commit: 77c8cb6

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[OskarDamkjaer]

Is this really needed? If we just remove the "are you sure?" dialog, it's quite fast to just click the trashcan on the individual connection? If we want some confirmation to avoid accidental deletions, I think that needing to click the button twice is a better pattern than a confirmation modal anyways. Typically first click makes the trashcan shift color, or become some other icon, or a "confirm" button to show that it needs to be clicked again to be removed