v0.6.4

Changelog

• Changed user - node relation logic (see note).
• Active node version is taken directly from the Gateway info endpoint instead of the user created node.
• Fixed Bottom panel connection chooser (issue #41).
• Removed delete and update functionality from Upstreams.
• Various fixes and improvements

Note: This version introduces changes in Konga's database. See issue #40 on how they can be implemented.