Refactor DSP interpolation code - #1825
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Various refactoring in order to a) investigate a fix for #1483 and b) helping the compiler to auto-vectorize the code in the future (which although doesn't work yet).
fluid_rvoice_dsp_interpolate_7th_order_local()function was generalized to an arbitrary order sinc interpolator in preparation to fix harmonic distortion when using 7th order interpolation #1483.FLUID_INTERP_7THORDER) was replaced by a higher order sinc due to quality drawbacks of the previous 7th order sinc.