[ios/osx] adds ActiveAE files to the IOS/OSX projects
[ios/osx] adds Darwin sinks
[ios/osx] remove CoreAudio engine
[darwin] OSX does not support E-AC3 passthrough
[darwin] drop LPCM mode from CDVDAudioCodecFFmpeg - it's not wanted or needed
[darwin] CDVDAudioCodecPassthroughFFmpeg was broken in 4f74e67f2f
[darwin] drop CDVDAudioCodecPassthroughFFMpeg
[osx] Drop ringbuffer, instead blocking in AddPackets for CoreAudio to read - saves a copy and additional latency