Add ability to load connection from URL bar

[cmdcolin]

This could be used to dynamically load e.g. a single file hub

[cmdcolin]

The needs of this could potentially go beyond just the ability to load single file hubs from the connection UI, so proposing as a separate issue.

[MayaSatishRao]

@cmdcolin I wan to contribute to this issue. Can you please describe the issue in detail?