WebSocket API

[eukreign]

Expose all of the current daemon commands via an asynchronous WebSocket API. Essentially this will be almost identical to the current HTTP based JSON-RPC API but over WebSockets where it can be truly asynchronous.

All this already exists in new sdk, so this is just a matter of porting it over to old sdk

• [ ] make it so all current commands work over websockets (est. 3 days)
• new events we want
  • [ ] wallet balance changed
  • [ ] add an event for get download progress
  • [ ] hub connection changes (connected to a hub, disconnected from a hub)
  • [ ] new support/tip
  • [ ] publish is confirmed

[tzarebczan]

We need better notifications about publish process + reflection - both should be solved by this epic, but if there's anything we can do before that, the better.

[lyoshenka]

next step: @eukreign will be making a list of what needs to happen. then we will review together