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Refactor //tools/gn/bin/gyp_flag_compare.py to be usable in interactive Python.

When comparing large targets like //chrome, it is nearly impossible to deal with
the mountainous 46,000 lines of output the executable script produces. With an
interactive environment, it is much easier to compare differences and drill-down
into specific issues.

BUG=622889
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/2108683002 .

Cr-Commit-Position: refs/heads/master@{#402512}