LAST UPDATE FEB 23 2018
Added ew PEQ (biquad) filter shapes:  high and low-pass, first and second order with variable Q;  and All-pass with variable Q
Added control for number of PEQ sections, with file saving only up to chosen number


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Added: analog Active Filters, DSP Parametric EQ, Opamps
Some fixes to off-axis sims. 
Fixed a crash in 3D at open of non-3d files