Fixes #29904, #30624, #29043, and #29647.

Versions bump, Changelog update

This reverts commit f75cf0bd. See:
bug 30639 for the reasoning behind the revert and some work we need to
do in the meantime.

NoScript 10.6.2 removes the workround for Mozilla's bug 1532530 which
caused drag-and-drop search emitting XSS warnings and a lot more false
positive XSS warnings as usual.

Cecylia Bocovich authored May 13, 2019 and Georg Koppen committed May 23, 2019

Ensure that cgo programs can be built with the nonexecstack ld flag

Fix for bug #30451

We use the upgrade to 1.12.x mainly to be able to make progress with
moving our macOS cross-builds to Debian Stretch. See: #30491 for more
details.

Versions bump and Changelog update

Fix by sisbell

Bug 30166: If custom bridges are specified, only use those bridges for connecting

Clean up our LICENSE file as well.

Place the Tor Launcher sources within browser/extension before
starting the Firefox build (instead of creating an .xpi which
was included during the tor-browser packaging step).

The operator may be able to respawn these bridges from different IP
addresses but the VMs no longer exist, so we can safely retire them now.

This fixes <https://bugs.torproject.org/30457>.

All of these bridges are long gone and have no business still being in
Tor Browser.

This fixes <https://bugs.torproject.org/30457>.

At the same time, move the creation of the Debug directory closer to
where we use it.