Support replacing range arguments with enumerate

[Tadaboody]

An extension of #4
The function range(start,stop,step) can be replaced with enumerate(islice(iterable,start,stop,step)) or even just islice if the index isn't used out of the assign.
for example

for i in range(3,len(seq),2):
    x = seq[i]
    ...

can be replaced with

for x in islice(seq,start=3,stop=None,step=2):
    ...

or in the case of a sequence (and not just an iterator) even

for x in seq[3:-1:2]:
    ...