Add speedup and slowdown mutations

[ENBYSS]

SPEEDUP: Has additional "speedup" factor which is an integer.
This is how it works, for example with [1,2,3,4,5,6,7,8,9]
SPEEDUP X2: [1, 3, 5, 7, 9, 6, 7, 8, 9]
SPEEDUP X3: [1, 4, 7, 4, 5, 6, 7, 8, 9]

SLOWDOWN: Has additional "slowdown" factor which is an integer.
This is how it works, for example with [1,2,3,4,5,6,7,8,9]
SLOWDOWN X2: [1,1,2,2,3,3,4,4,5...]
SLOWDOWN X3: [1,1,1,2,2,2,3,3,3...]

This one should wrap around.