contain pixelization too
still in test stage

+ fixed early timecode deallocation

Determine Windows not only by the presence of mingw substring but also
accept msys.

* for supported devices, allow use of Level A 3G-SDI on playback
* updated Linux and macOS SDKs

* do not exit control when rewinding
* clamp indices when outside boundries

Check number of available RX/TX channel first to give user reasonable
error message if the device doesn't have enough.

For devices with bi-directional channels, set the correct layout.

This is a workaround for situations when the sound falls silent if video
is enabled after audio.

Library is now BlueVelvet64 on 64-bit systems instead of original
BlueVelvet.

Use of libx264/libx265 is forbidded even if given with 'encoder' option.
On the other hand, alternative encoders are allowed for H.264/H.265 in
BSD build.

SDL events and new frames are now dispatched from the same queue. This
allows removing CV for frames and timed wait on that condition variable
(which allowed responsivity even if no data arrived).

*Combines video inputs from multiple sources

CLOCK_REALTIME is available only since macOS 10.12 and was used just in
the platform_time.c file (under macOS).

Added a FPS option as a more common alternative to TFP.

It looks like that with some devices (Magewell, Epiphany), it is not
safe to enqueue buffers in different thread than it was dequeued.
Therefore, now it is done from within the same thread.