libobs, UI: Add true peak measurements
Add a new algorithm to calculate the true-peak. It implements the Whittaker- Shannon interpolation from four samples to create 4 intermediate samples (5 x oversampling) inbetween the middle two samples. With 4 samples and 4 intermediate samples the algorithm can be implemented as a 4x4 vector-matrix cross product, which is ideal for SSE. I've also replaced the sample-peak algorithm using SSE as well to improve performance. Closes obsproject/obs-studio#1189
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