Various nits

- nits on via_list
- Nit on User definition.
- s/apending/appending/
- s/false (0)/false(0)/
- s/ForwardingOption/ForwardingOptions/
- s/ICE ,/ICE,/
- s/bootstrap-peer/bootstrap-node/
Remove anycast/multicast/broadcast language

- As agreed in Vancouver, I removed the anycast/broadcast/multicast
  stuff and put it in a separate draft.
- Note that Wilacrd Node-ID is still in -base, even if it is not used at
  all, because there is special rules to process it in the routing part.