use Smooth's default interpolation

was lancsoz (sinc) to test performance, but this is superflous because it only
really applies to subpixel interpolation of the canvas
refactor audionode graph patching
fix time quantization according to strobe period

in this episode nothingmuch confuses the dividend and divisor yet again

in addition, the remainder of the frame duration is now accounted to reduce the
rounding errors which were clamping strobe_delta_t close to 0 effectively
adding a constant buffer sized latency even without the aforementioned bug