Use COUNTOF to set the number of speakers
Use a method to set omni-directional channel gains
Add LFE to the speaker arrays
Set gains using the device channel index
Fix panning of multi-channel sources
Remove the channel name from ChannelConfig
Support 5.1 and 7.1 in alffplay
Don't increment the output buffer in the Write_ methods
Don't use FrontLeft and FrontRight to reference the dry buffer
Play zero-distance/zero-radius sources from the front
Merge remote-tracking branch 'upstream/master' into travis-linux-x86