Development of AudioNodes

[TheMutta]

Adding audio managment capabilities to depthai with the creation of various audio nodes for audio capture, output, mixing, encoding and replay.

• AudioIn and AudioOut as endpoints for raw audio passing through alsa devices.
• AudioEncoder recieves data from one endpoint and converts it to some other format.
• AudioReplay, which plays a specific audio file on host.
• AudioMixer, tasked with multiplexing audio inputs and outputs