Versions bump and Changelog update

This reverts commit 7dc74d16.

Make sure we use the includes from our build of gcc instead of the ones
from /usr/lib/gcc:
https://trac.torproject.org/projects/tor/ticket/26323#comment:7

We now generate source tarballs for firefox, torbutton and tor-launcher
during stable, alpha and nightly builds. We don't generate them with
|make testbuild|, but they can be generated with |make testbuild-src|.

Fixes #29660 and similar bugs where tor mishandled empty SOCKS auth.
See #29175 for more details.

Conflicts:
	projects/orbot/build

We don't use Orbot's VPN mode and therefore don't need pdnsd bundled.
Thanks, Nathan, for noticing.

There should be no excuse anymore to use plan HTTP (even though, we
check the SHA-256 sum). Use HTTPS where possible.

Update rbm to set DEBIAN_FRONTEND=noninteractive when using apt-get in
install_package.

Also set DEBIAN_FRONTEND=noninteractive for the other apt-get commands
we use in debootstrap-image and container-image.

We now also use the -q (quiet) argument.

By default dma will send emails by connecting to the configured mail
server on port 25.

According to https://riseup.net/en/email/clients we should be connecting
to mail.riseup.net on port 587.

Changelog update and versions bump

We were previously using the linux-i686 langpacks in the linux-x86_64
builds.

David Fifield authored Feb 05, 2019 and Georg Koppen committed Feb 06, 2019

First added in https://bugs.torproject.org/15512 for Firefox 38 ESR,
these are no longer needed.

Tor Browser no longer sets these to false:
https://bugs.torproject.org/14952#comment:49
https://github.com/arthuredelstein/tor-browser/commit/14952+1

network.http.spdy.enabled.http2draft no longer even exists:
https://bugzilla.mozilla.org/show_bug.cgi?id=1132357

network.http.spdy.enabled.v3-1 no longer even exists:
https://bugzilla.mozilla.org/show_bug.cgi?id=1248197

The nightly version of obfs4 now requires Yawning's utls fork, so we
change projects/goutls to use Yawning's fork.

While doing that we rename keyring/obfs4.gpg to keyring/yawning.gpg, to
use the same keyring in obfs4 and goutls. And we refresh it to get the
new subkeys.

boklm authored Jan 30, 2019 and Georg Koppen committed Feb 01, 2019

The build of HTTPS-Everywhere requires python3.6, however the python3.6
package which we were using has now been removed from Debian Unstable.

We now build python 3.6 ourselves. As the different platforms use a
different suite by default, we add the common-stretch target to
rbm.conf, which we use to avoid building a different python for each
platform.