Revert "AESinkPULSE: Let Engine handle our volume"

This reverts commit 566e0efb7617bcf78063b6a3ad9ccc4005f39a70.
AESinkPULSE: Restore and sync volume with external programs
AESinkPULSE: Change samplerate to pulseaudioserver rate
AESinkPULSE: return false if device could not be found
Merge pull request #4451 from fritsch/pa-volume-fix-mainline

PulseAudio: Rework Volume
[depends] move ffmpeg to unified deps
[configure] remove internal ffmpeg
ffmpeg: remove dll wrappers
add ffmpeg lock manager
todo: refactor to own file
ffmpeg: move callbacks into separate file
remove ffmpeg dlls from generated headers
not removing win32 as this might still be needed?
[rpi] setup-sdk.sh: allow overriding of buildroot and xbmc install paths
also don't require root if not needed
add ffmpeg makefile for rpi
[WIN32] download and compile ffmpeg from remote source.
[WIN32] make XBMC compile, build and run with the ffmpeg link libraries.
[WIN32] use ffmpeg version from tools\depends\target\ffmpeg\FFMPEG-VERSION
[WIN32] prepare mingw build files for jenkins.
[WIN32] removed old mingw build files.
ffmpeg: bump version to 2.2
[depends] add --with-platform=raspberry-pi switch