M_random rework/multiple random states

tertu marybigrequested to merge
tertu/SRB2:random-rework into next
  • Added RN system for multiple random number states with Lua bindings
  • Replaced M_Random with macros using an RN state
  • Added I_GetRandomBytes to get random numbers from an OS-defined source
  • Other minor modifications
Edited by tertu marybig

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