Math cleanup and optional new PRNG

[V10lator]

THis removes some duplicated math function, removes local return values from math functions and adds the option to use the pseudo random number generator of the C library.

[coco875]

some of this change are #215, but mainly not sure if we should move to cglm for all algebra

[MegaMech]

Could you explain more about what PRNG is?

[V10lator]

Could you explain more about what PRNG is?

A PRNG is a pseudo random number generator. Different to a real random number generator it isn't really random but pseudo, meaning it uses a seed and deterministic math to get random numbers. PRNGs are normally used when the randomness doesn't need to be secure but fast.

See also: https://en.wikipedia.org/wiki/Pseudorandom_number_generator

[V10lator]

Oh and in case you ask why change it?

The mario kart / vanilla kart PRNG seems to be extremely simple and as a result biased towards specific numbers. This causes effects such as multiple players getting the same items in a row. With this PR it is possible to use the PrNG from the C standart library instead which is used in countless software and probably way less biased towards specific numbers.