Move trigonometric functions to new FPRT structure

[densmirn]

Additionally moved call_fptr_1in_1out and call_fptr_2in_1out to backend.pyx.

[codecov]

Codecov Report

Merging #80 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #80   +/-   ##
=======================================
  Coverage   51.45%   51.45%           
=======================================
  Files          19       19           
  Lines        1201     1201           
  Branches      312      312           
=======================================
  Hits          618      618           
  Misses        333      333           
  Partials      250      250           

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[shssf]

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