More math functions

[JeanJPNM]

Adds custom implementations for the following math functions:

• Math.sign

  Math.sign = (x: number) => {
    return (x > 0) - (x < 0);
  };

• Math.round

  Math.round = (x: number) => {
    return Math.floor(x + 0.5);
  };

• Math.trunc

  Math.trunc = (x: number) => {
    return x - (x % 1);
  };

• Math.exp

  Math.exp = (x: number) => {
    return Math.pow(Math.E, x);
  };

• Math.expm1

  Math.expm1 = (x: number) => {
    return Math.exp(x) - 1;
  };

• Math.cosh

  Math.cosh = (degrees: number) => {
    const x = degrees * Math.degToRad;
    return (Math.exp(x) + Math.exp(-x)) / 2;
  };

• Math.acosh

  Math.acosh = (x: number) => {
    return Math.log(x + Math.sqrt(x ** 2 - 1)) * Math.radToDeg;
  };

• Math.sinh

  Math.sinh = (: number) => {
    const x = degrees * Math.degToRad;
    return (Math.exp(x) - Math.exp(-x)) / 2;
  };

• Math.asinh

  Math.asinh = (x: number) => {
    return Math.log(x + Math.sqrt(x ** 2 + 1)) * Math.radToDeg;
  };

• Math.tanh

  Math.tanh = (degrees: number) => {
    const x = degrees * Math.degToRad;
    return (Math.exp(x) - Math.exp(-x)) / (Math.exp(x) + Math.exp(-x));
  };

• Math.atanh

  Math.atanh = (x: number) => {
    return (Math.log((1 + x) / (1 - x)) / 2) * Math.radToDeg;
  };

For the sake of consistency with the mlog trigonometric functions, these ones also use degrees instead of radians.

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