Update coding style and add .clang-format
small ordering cleanup of init help message
doc: Modernize steps to be followed after release

Remove old references to sourceforge, add what actually should be done
and provide some more details.
[Qt] format ping times in peers tab as ms

- also align ping times to the right
more Bitcoin -> Bitcoin Core string changes
build: Fix windows configure when using --with-qt-libdir

fixes #4630

Github-Pull: #4633
Merge pull request #4626

e1eb741 doc: Modernize steps to be followed after release (Wladimir J. van der Laan)
Merge pull request #4629

ead6737 [Qt] format ping times in peers tab as ms (Philip Kaufmann)
Merge pull request #4615

283a3b8 small ordering cleanup of init help message (Philip Kaufmann)
Merge pull request #4631

a409467 more Bitcoin -> Bitcoin Core string changes (Philip Kaufmann)
qt: bitcoin_en update after 8d0d512
Merge pull request #4498

2887bff Update coding style and add .clang-format (Pieter Wuille)
small cleanup - use of CloseSocket()

- call CloseSocket() before printing any text (ensure consistent
  usage in the code), exception is when using NetworkErrorString()
- also use same form and comment for disabling sigpipe