main: add two more test threads, improve all test threads to use pseudo-random numbers (without seed)
main: add two more test threads, improve all test threads to use pseudo-random numbers (without seed)

CezaryGapinski/distortos,jasmin-j/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,jasmin-j/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,DISTORTEC/distortos,jasmin-j/distortos,jasmin-j/distortos,jasmin-j/distortos,DISTORTEC/distortos