libobs: Add audio control functions
This adds a new library of audio control functions mainly for the use in GUIS. For now it includes an implementation of a software fader that can be attached to sources in order to easily control the volume. The fader can translate between fader-position, volume in dB and multiplier with a configurable mapping function. Currently only a cubic mapping (mul = fader_pos ^ 3) is included, but different mappings can easily be added. Due to libobs saving/restoring the source volume from the multiplier, the volume levels for existing source will stay the same, and live changing of the mapping will work without changing the source volume.
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libobs/obs-audio-controls.c
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libobs/obs-audio-controls.h
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