Support custom http user agent string management

See merge request !249

Integrates custom user agent strings into EmbedLiteView. This includes
allowing a custom user agent string to be sent by and receiving
notifications about the actual user agent string used for a request.

Switch LOGNI() for LOGT() in places

See merge request !250

LOGNI: "Not implemented"
LOGT:  "Trace"

In some places where an implementation has been added, LOGNI() should be
switched for LOGT().

[sailfishos][embedlite][egl] Fix mesa egl display initialisation

See merge request !241

Part 1/2 On mesa based systems, the egl display does not like being initialised
twice.

This patch retrieves the egl display from qtmozembed and uses that.
If the display is not EGL_NO_DISPLAY then dont initialize it.
A related change is required in qtmozembed to return the egl display.

Part 1/2 On mesa based systems, the egl display does not like being initialised
twice.

Extend the embedlite api to allow the EGLDisplay to be returned with the
context.

[sailfishos][rpm] Don't exclude libs that are not bundled. JB#51312

See merge request !242

Don't exclude libs from the dependency scanner where the
--system-foobar variant is used instead of the in tree version of the libraries.

[sailfishos][embedlite] Add an API to load desktop version of the site. Contributes to JB#50924

See merge request !207

[sailfishos][gecko] Don't return null from getComputedStyle when there's no presentation. JB#52451

See merge request !215

Backport of mozilla bug 1467722 that is fixed in mozilla62.

https://bugzilla.mozilla.org/show_bug.cgi?id=1467722

Use new SB2_RUST_USE_REAL_* mechanisms to reduce deadlocks in build

See merge request !213

The deadlocks are suspected to be due to sb2 malloc during threaded
fork/exec. When cross-rust is deployed the SB2_RUST_USE_REAL_* env
variables will enable the sb2 avoidance code.
Signed-off-by: David Greaves <david.greaves@jolla.com>

Introduce EMBED_SAFEMODE environment variable

See merge request !212

This is needed in order make/keep rendering pipeline working on Sailfish OS
when safemode is enabled.

See EmbedLiteXulAppInfo::GetInSafeMode and related change.

The gfxPlatform.cpp must be fixed to ignore safemode so that rendering
pipeline keeps on working.

[sailfishos][embedlite] Disable dom.w3c_pointer_events. Fixes JB#51882

See merge request !211

Log bad tex upload calls and errors

See merge request !210

Derived from the original gecko bugzilla patch.
https://phabricator.services.mozilla.com/D20429
https://bugzilla.mozilla.org/show_bug.cgi?id=1290770

This was introduced into mozilla 67, so should be removed afterwards.

Bug 1290770 - Log bad tex upload calls and errors. r=lsalzman

Differential Revision: https://phabricator.services.mozilla.com/D20429

[sailfishos][embedlite] Enable customelements. Fixes JB#51937

See merge request !208

[sailfishos][gecko] Treat document-level touch event listeners as passive. Fixes JB#52412

See merge request !209

[sailfishos][gecko] Bug 1449268 - Treat document-level touch event listeners as passive. Fixes JB#52412

[sailfishos][embedlite] Define "pulse" as cubeb backend. Fixes JB#52414

See merge request !206

Without this initialization cubeb_init on cubeb.c fails to initialize
pulse audio backend. Due to that setting for instance volume level
was failing.

[sailfishos][gecko] Hide accessible carets also with touch  select all event. Fixes JB#51643

See merge request !205

[sailfishos][embedlite] Schudule view update only when activating. JB#52415

See merge request !204

Enable event.srcElement on all channels

See merge request !203

Derived from the original gecko bugzilla patch.
https://bug453968.bmoattachments.org/attachment.cgi?id=8973297
https://bugzilla.mozilla.org/show_bug.cgi?id=453968

This was introduced into mozilla 62, so should be removed afterwards.

Bug 453968.  Enable event.srcElement on all channels.  r=smaug

I could keep using BinaryName to make the IDL look more like the spec, but this
is a bit more efficient...

[sailfishos][media] Drop media buffer tweaks and reformat patches. JB#52385

See merge request !202

The buffer changes made some other videos playback worse, and broke some
completely.

Export patches with 'git format-patch -N --zero-commit' to make them
easier to move around.

[sailfishos][gecko] Start using user-agent builder. JB#52068

See merge request !200

[sailfishos][gecko] Replace RELEASE_OR_BETA setting with milestone override. JB#51300

See merge request !199