gpython: Factor-out options parsing into getopt-style _IGetOpt helper
Python allows multiple single-letter options and their arguments to be coming on single argument, for example: python -OQc'print 1' python -OQc 'print 1' python -OQ -c 'print 1' etc... We are currently trying to handle that at every option, but even though it kind of works, it is limited and will break once we will start adding options. -> Refactor options parsing into getopt-style helper. We cannot use getopt itself because it will complain e.g. on `gpython file.py --my-custom-opt` that my-custom-opt is unexpected.
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