Get RLBox code integrated into Tor Browser

RLBox currently lives in a third-party/rlbox dir in mozilla-central. We need to backport it's integration and make sure it is compiling properly in our ESR 68 environment.

Trac:
Parent Ticket: #32379 (moved)

added GeorgKoppen202002 component::applications/tor browser owner::tbb-team parent::32379 priority::medium resolution::duplicate severity::normal status::closed tbb-security type::task labels

https://bugzilla.mozilla.org/show_bug.cgi?id=1566235 is a good starting point.

bug_32381 (https://gitweb.torproject.org/user/gk/tor-browser.git/log/?h=bug_32381) has all the changes to RLBox that landed on mozilla-central so far.

Moving my tickets to December.

Trac:
Keywords: GeorgKoppen201911 deleted, GeorgKoppen201912 added

No December anymore.

Trac:
Keywords: GeorgKoppen201912 deleted, GeorgKoppen202001 added

Move my tickets to Feb 2020.

Trac:
Keywords: GeorgKoppen202001 deleted, GeorgKoppen202002 added

Let's do all the backports in one bug, that is #32380 (moved).

Trac:
Resolution: N/A to duplicate
Status: new to closed

closed

mentioned in issue #32379 (moved)

moved to tpo/applications/tor-browser#32381 (closed)