Fix #110 - Folder structure overhaul

[nth10sd]

This fixes #110 - it overhauls the folder structure of funfuzz completely and makes it installable as a pip module. A lot of changes are fairly mechanical.

We should ideally first release 0.1.0 as an initial legacy version with all the old path structure, similar to Lithium. (DONE)

To be updated later in this PR: (DONE)
* Update scripts to no longer execute *.py files directly, but instead as a module
* Update documentation with how-to-run

Next steps (outside of this PR):

• Implement a testing structure with code coverage, as per Lithium
  • Nice-to-have before we start refactoring
  • [funfuzz] funfuzz should be installable #110 - This folder structure overhaul is a pre-requisite
• Replace tooltool usage with fuzzfetch
  • tooltool is incompatible with Python 3 and TaskCluster
• [funfuzz] Move to argparse away from optparse #14 - Replace optparse with argparse
• [funfuzz] Overhaul logging functionality #84 - Use logging instead of printing output statements
• Continue investigating support for Python 3
  • At least update code that pylint detects as bad-python3-import and old-division
  • We will eventually settle for Python 3.5 and up
  • Python 3.5 has subprocess.run()
• Consider splitting out compile_shell and maybe autobisectjs, but the latter may be deprecated by a newer tool soon

[nth10sd]

For the main python -m funfuzz issue, I will merely exit now if the zip file of signatures is not found locally or via Collector. Ideally, the signatures should be found, ~/trees/mozilla-central should be present, then fuzzing will continue via compilation. Or if the latter isn't available, downloaded shells will be used (this relies on upcoming fuzzfetch integration). This could be done better, but it's a hotfix for now.

For the loop issue, there is a missing argument. It should be:

python -m funfuzz.js.loop --random-flags 20 ANYTHING $tmd

ANYTHING is not actually used by anything now, it will be ripped out when I subsequently move to argparse.

I will re-request review only I finish the following to-dos: the loop_bot issue as well as the following notes to self:

ag --ignore=tooltool/ --ignore=util/ --ignore=after-fix.txt --ignore=shell_flags.py --ignore=gen-grammar.js --ignore=known_broken_earliest_working '\.py'
ag '\.py'

[jschwartzentruber]

Looks good to me. I did minimal testing but I did let it compile and run and didn't see any issues. Have you let it run long enough to exercise the lithium integration? Reported to FuzzManager?

[jschwartzentruber]

r+ conditional on confirming funfuzz.bot runs through reduction and reporting to FM without issue.

[nth10sd]

funfuzz.bot now runs through reduction and reports to FM without issue.