[confluence] replace subtitle flag icons with new ones

As discussed in #3552, this replace the subtitle flag icons with new
32x32 pixel icons from https://www.gosquared.com/resources/flag-icons/

This also fixes some wrong flags like uk. It's Ukrainian not United
Kingdom.
[url] don't run ValidatePath() on hostnames where the protocol has an encoded hostname. fixes #14699
[depends] update PCRE version, use new configure flags
[depends] update PCRE version for native tools
[dxva] fixup: anaglyph 3d
videodb: fix SQL query in CleanDatabase() not considering NULLed fields
ActiveAE: fix clipping for sinks using AE_FMT_FLOAT
AESinkALSA: Open 5.1 Layouts according to CEA-861-D
Merge pull request #3720 from FernetMenta/aefixes

ActiveAE: fix clipping for sinks using AE_FMT_FLOAT
Merge pull request #3721 from fritsch/ae-use-cea-for-speaker-layout

AESinkALSA: Open 5.1 Layouts according to CEA-861-D
[GLES] Avoid getting viewport so often

GLES is generally offloaded to a GPU and fed a stream of commands.
These can be executed asynchronously by GPU and there is no need for the host to block.
Whenever a gl call requires a result back that may be affected by previous commands
the queue needs to be drained and a result returned from GPU. This acts as a bottleneck.

Looking closely at what xbmc does, there is only one call that requires a result that is
executed every frame. That is glGetIntegerv(GL_VIEWPORT).
However xbcm is perfectly capable of remembering what it set this to.

By using a cached version of this value, on a Pi, the framerate improves from 69fps to 95fps,
with vsync disabled, and RSS feed showing in home screen.
[rbp] Avoid crash when useddsfanart is enabled

Pi textures don't contain pixels on the arm, and the dds encode path wasn't protected against that.
Also don't allow dds to be enabled, as it is undesirable on Pi
[rbp/omxplayer] Avoid setting TIME_UNKNOWN on packet with STARTTIME set

It stops streams with no timestamps (e.g. raw h.264) from playing
[rbp/omxplayer] Fix typo from 847c746e07983652e05818a435c5115049a2d694
[rbp/omxplayer] Defer demuxer pause until buffers full

See #3377
CArchive: fix support for missing CVariant type
[rbp/omxplayer] Handle sample rates below 8kHz

GPU requires sample rates above 8kHz, so limit the requested sample rate to 8kHz
(lower rates will be resampled)
Merge pull request #3698 from Montellese/videodb_cleanup_sql_fixes

videodb: SQL query fixes for clean database
Merge pull request #3685 from Karlson2k/pcre_dep_update_01

[depends] update PCRE version, use new configure flags
Merge pull request #3732 from popcornmix/low_sample

[rbp/omxplayer] Handle sample rates below 8kHz