Bugfix for long random strings and more randomness

Bugfix to allow long random strings (> 5*26) and more randomness (string with length=10 must allow 10 times the same chars)

Nah `quickRandom` is nice to generate token-like stuff, codes etc. I've used it a bunch of times but not as something secure. It's the actual `random` I'd remove and let people use more robust/secure built-in methods.