Add AMD Advanced Media Framework plugin to OBS

[Xaymar]

Adds support for the AMD Advanced Media Framework through a plugin licensed under MIT. The SDK for it (AMF SDK) is also licensed under MIT.

Plugin Version: 1.3.0pre5 Binaries for Installer Bundling

[ONSBalder]

Can one of the admins verify this patch?

[ovr]

@Xaymar cool job, is it needed an additional flag for cmake to compile plugin?
I see BUILD_AMF_ENCODER directive and it's false by default (or manually edit?)

I am having RX480 / Linux 4.8 / Ubuntu 16.10, I would like to test it on weekends

[Xaymar]

@ovr Only BUILD_AMF_ENCODER is needed to be enabled. Building requires the following:

Prerequisites

• Windows® 7 (SP1 with the Platform Update), Windows® 8.1, or Windows® 10
• Visual Studio® 2013 or Visual Studio® 2015
• Windows 10 SDK (Version 10586)
• AMD Radeon Software Crimson Edition 16.7.3 (16.30.2311) or newer

And of course it needs a windows system to run right now.

[ovr]

@Xaymar Awwww, seems Linux is not supported GPUOpen-LibrariesAndSDKs/AMF#4 :(

[Xaymar]

As far as I've seen, gstreamer partially supports encoding on the GPU with VAAPI - my understanding of gstreamer is limited though. I hope that in the future the linux drivers will see enough updates so that this is possible there too.

[Xaymar]

Nuking this PR as i accidentally did all the changes in the master branch instead of the sub branch. I'm stupid sometimes. Edit: Also because I'm too stupid to figure out how force pushing changes