Function call syntax for binary operators

What's Changed

• Binary function call syntax by @bertiqwerty in #52
• Added atan2, asinh, atanh, and acosh to default operators.
• Added fuzzing-tests for Val to pipeline
  • Fixed operator fact vor Val panic on overflow.
  • Fixed wrong error propagation for Val that lead to very large memory and cpu consumption due to false string concatenations.

Full Changelog: v0.18.0...v0.19.0