Add `random()` and `random_seed()`

From the random() reference page:

Generates random numbers. Each time the random() function is called, it returns an unexpected value within the specified range. If only one parameter is passed to the function, it will return a float between zero and the value of the high parameter. For example, random(5) returns values between 0 and 5 (starting at zero, and up to, but not including, 5).

If two parameters are specified, the function will return a float with a value between the two values. For example, random(-5, 10.2) returns values starting at -5 and up to (but not including) 10.2. To convert a floating-point random number to an integer, use the int() function.

From the randomSeed() reference page:

Sets the seed value for random(). By default, random() produces different results each time the program is run. Set the seed parameter to a constant to return the same pseudo-random numbers each time the software is run.

Inizia dalle pagine di riferimento di random() e randomSeed() collegate nell’issue, quindi individua i corrispondenti punti di ingresso della Processing API in libprocessing. Implementa entrambe le funzioni con il comportamento documentato per uno e due parametri e un output deterministico con un seed, quindi verifica che l’API risultante corrisponda a questi esempi.