Add explicit Context to ListenV4 and ListenV5.
This makes it possible to stop listening by an external signal.

Silence non-important comments in the "make erigon" output.

* use "log" for struct fields
* use "logger" for function parameters and local vars

This is a compromise between:
1) using logger := log.New() to avoid aliasing (log := log.New())
2) and keeping it short when logging e.g.: srv.log.Info(...)

* rename from Datadir to DataDir (functions and public vars)
* rename dataDir to datadir (local variables)

* done

* removed sleep

* f

* errors.Is(err, io.EOF) instead of err == io.EOF

Co-authored-by: yperbasis <andrey.ashikhmin@gmail.com>

Co-authored-by: Alex Sharp <alexsharp@Alexs-MacBook-Pro.local>

* mainnet

* save

* save

* save

* save

* save

* erigon

* save

* Simplify TerminalBlockHash & TerminalBlockNumber

* Simplify FeedHeaderPoS

* More accurate comment

* Relax TerminalBlockHash check

* Extract the sleep hack into stageLoopIsBusy

* Several short naps instead of a single longish sleep

* Fix coinbase in stage_mining_exec

* More orthodox loop

* typo in comment

* Fix for BSC incorrect execution

* collect skip analysis

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* more rpc emed flags

* more rpc emed flags

* more rpc emed flags

* initial

* binary search through blocks

* snapshot

* returning highest block

* oldest block is now 0

* multiple test written for  getBlockByTimeStamp

* retrieved picked block time stamp

* added into erigon_api

* returning pointer

* reverting c37b99b2

* deleted print

* proper rpc block response

* fixing test

* returning lowest block

* lint

* typo

* fixed test

* returning lowest-1

* skip while loop for times too big or small

* added to readme

* using sort.Search

* More tracing

* More tracing

* More tracing

* Keep correct txNum

* Keep correct txNum

* Update to tracing

* Off by one

* Print memory info

* Quicker startup

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* little fix

* feed pos

* save

* save

* save

* save

* save

* save

* save

* ReadHeader instead of ReadHeaderByHash

* Add Engine API to rpcdaemon README

* Fix nil pointer dereference in HandlePendingBlock

* Fix latestValidHash JSON

* Delete GetPayloadBodiesV1

* Break infinte unwind loop in handleForkChoice

* More logging

* save

* save

* Another fix for history files

* Fix NPE

* Another fix

* Proper closing sequence

* Remove first byte insert flag

* Fixes

* Update

* Add traceblock to erigon2 command

* Update

* Update

* Update

* Update

* print panic

* Fix history reads

* Update

* Update locks

* Update

* Fixes

* Set changesets and commitments upfront

* Logging instead of printing

* Fixes in aggregator and recsplit

* Update to erigon-lib

* Remove empty commitments

* Update

* Update

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>
Co-authored-by: Alex Sharp <alexsharp@Alexs-MacBook-Pro.local>