preserve single precision in CWT #507
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As discussed with @alsauve in #479,
cwtcurrently promotes single precision inputs to double precision. This behavior is inconsistent with all other transforms in PyWavelets.In this PR:
1.) the output array is declared matching the precision of the input.
2.) the internal convolution or FFT-based convolutions operate at the precision of the input
Aside from consistency this can improve performance and reduce memory use when working with single precision data.