crashes on using prng in data-final-fixes.lua

Speaking of prng, seeding by repeatedly math.random is dreadful. Maybe implement something like Xorshift?

I have used PRNG before but the resulting numbers were not distributed even.
If you hand me a more detailed crash report, I can fix the bug.

Actually only seems to do it with the Merging Chests mod enabled.

Failed to load mod "zEstarteRandomizer": zEstarteRandomizer/data-final-fixes.lua:3: attempt to call field 'new' (a nil value)
stack traceback:
zEstarteRandomizer/data-final-fixes.lua:3: in main chunk

Cant reproduce, game starts for me with merging chests mod enabled.