Generate a network syncronised random seed for AI's

[quantumstate]

AI's can currently use the Math.random() function but the seed is always the same. This should be set randomly at the start of a match.

Currently AI's try to use the game's state to generate some entropy in the random numbers which is not ideal.

[wraitii]

Adding to this: for debugging purposes, it would be nice to have this as a configurable variable (or to be able to overwrite it). It's sometimes nice to have games following the same patterns for debugging AIs.