* Discv5: More error handling improvements
- More results usage and raises pragma annotations
- Remove ENode related code and adjust Node object
- Misc.
* Add sendMessage and catch RlpError when decoding WhoAreYou
* Make the receive proc exception free
Except for `Exception` hah...
* Address review comments
* And another bunch of results and raises annotations
* Send Nodes Message also on 0 nodes and remove usage of broken require