Routines 
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This updates the values used to add randomness to the spacehsip appearance timing and the way the barriers are nibbled away by the alien's bullets, etc. It's not random as such, more a churn of numbers to break up patterns.
The algorithm hasn't been properly analysed.
Used by the routines at generate_alien_bullets and bullet_barrier_hit.


update_cycler_values  32059  LD HL,(_CYCLER_3)  Cycler value into HL  
32062  RL L  
32064  RL H  x2  
32066  RL L  
32068  RL H  x4  
32070  LD C,H  That goes into C  
32071  LD A,(_CYCLER_1)  Cycler value into A  
32074  RLA  x2  
32075  LD B,A  That goes into B  
32076  LD DE,(_CYCLER_2)  Amalgamation of cycler values  
32080  RL E  
32082  RL D  x2  
32084  RES 7,D  Limit to 32767  
32086  LD HL,(_CYCLER_1)  Add the value worked out into BC into this cycler value  
32089  ADD HL,BC  
32090  LD (_CYCLER_1),HL  
32093  LD HL,(_CYCLER_3)  Add the value worked out into DE into this cycling value limited to 32767  
32096  ADC HL,DE  
32098  RES 7,H  
32100  LD (_CYCLER_3),HL  
32103  RET P  
32104  LD HL,_CYCLER_1  Don't let this cycling value settle at zero  
update_cycler_values_0  32107  INC HL  
32108  RET NZ  
32109  INC HL  
32110  JR update_cycler_values_0 
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