"vls lite" in proxy mode

[Evanfeenstra]

Start VLS connected to proxy broker: only node id used

[Evanfeenstra]

• proxy keeps track of which wallets are "remote" and which are "local"
• proxy has a connected MQTT broker
• signatures are collected via MQTT ping
  • invoice received
  • "signMessage" call
  • ECDH call
• sphinx-key needs to auto-detect whether the broker its connected to is a full lightning node or proxy wallet, and start up in different modes
• MIGRATING from proxy to full node!!!