[Feature] Redo the "Transfers" UI with support for multiple "Servers"

[Jack-Edwards]

Description

I would like to implement a new UI for showing a user their encrypted items. This new UI should support the possibility of multiple "servers" down the road.

For example, imagine a basic file explorer application with a left-hand menu. Items in the left-hand menu might be:

• Servers
• • Community Cloud (the storage Crypter uses today, capped at 10 GB)
• • • Transfers
• • • • Files
• • • • Messages
• • Personal Cloud (a paid option for managed cloud storage)
• • • Transfers
• • • • Files
• • • • Messages
• • • Storage Root
• • • • [ user-defined folders and files ]
• • Self-Hosted Server 1 { user-friendly name, ip address, up/down status, is default (for incoming transfers) }
• • • Transfers
• • • • Files
• • • • Messages
• • • Storage Root
• • • • [ user-defined folders and files ]
• • Self-Hosted Server 2 (same as above)
• • • Transfers
• • • • Files
• • • • Messages
• • • Storage Root
• • • • [ user-defined folders and files ]
• • Self-Hosted Server 3 (same as above)
• • • Transfers
• • • • Files
• • • • Messages
• • • Storage Root
• • • • [ user-defined folders and files ]