Check Bolt 9 specs

[SWvheerden]

This issue tracks BOLT #9: Assigned Feature Flags, this here so we can check all requirements.

• option_data_loss_protect
• initial_routing_sync
• option_upfront_shutdown_script
• gossip_querie

[SWvheerden]

#202

For Initial routing sync

[SWvheerden]

de linking from issue 129,

[TheBlueMatt]

I think we shouldn't rush to implement gossip_queries yet, there's a few proposals floating around for replacing at least parts of it and at least personally I dunno about taking a zlib dependency. All the rest are probably good ideas.

[SWvheerden]

option_data_loss_protect not yet implemented #238

[SWvheerden]

Option_upfront_shutdown_script not yet implemented #239