Function seededRandom

seededRandom(seed: string): () => number
Creates a random function that returns the same sequence of numbers in [0, 1) for the same seed

Use it wherever Math.random would go when results must repeat, such as a level generated from a shared seed or a replay. It runs mulberry32, seeded by hashing the string with xmur3, and isn't safe for cryptography.
Parameters
- seed: string
  Any string; the same string always gives the same sequence
Returns () => number
Function that can be used in place of Math.random
See
https://stackoverflow.com/a/47593316
Example
```
const random = seededRandom(`level-${levelNumber}`);

for (const slot of treeSlots) {
  if (random() < 0.3) plantTree(slot, 0.8 + random() * 0.4);
}
```