Previously it was using P_SetRandSeed, which sets both initial and current seed to the same thing, since it's meant for level load init. It first set all RNG seeds to the current seed, and then it set all of the seeds to their initial value. The comment about this just says its "stupid and hacky", and I have no idea how it even worked before.
Now we send over both init seed and current seed independently and set them both. Hopefully this will fix the desyncs.
P_RandomChance is now a macro for something that should happen a
certain percentage of time.
P_SignedRandom was moved to a macro. Nobody cared.
# Conflicts:
# src/p_inter.c
This actually passes most diehard tests, as opposed to the old RNG.
It's also similarly fast.
Internally the PRNG generates a fixed point number from [0,1) now,
which makes P_RandomKey and P_RandomRange much easier to
calculate. P_Random is just a simple shift, as well.
Also, the lack of floating point math in P_RandomKey and
P_RandomRange now is probably for the best.
