Mythx-cli

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- Add experimental Scribble integration for property validation
- Remove bytecode payload option due to lack of usage
- Require users to explicitly consent to analysis submission
- Add feature that allows users to force a certain analysis scenario
- Clean up code into payload-related job objects
- Fix issue where pypy7.1.1-beta0 doesn't support PathLike in os.chdir
- Slim down Solidity file walking logic
- Refresh payload documentation
- Refactor payload-related tests
- Update :code:`py-solc-x` to 0.9.0
- Update :code:`sphinx` to 3.1.1
- Update :code:`pytest-cov` to 2.10.0
- Update :code:`tox` to 3.15.2

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- Whitelist OSX solc installations in :code:`py-solc-x`
- Update :code:`bumpversion` to 0.6.0

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- Fix bug where payload path prefix trimming was incorrect
- Generate source list from Truffle artifact files
- Improve Solidity file walk performance
- Refactor payloads submodule
- Update :code:`tox` to 3.15.0
- Update :code:`pytest` to 5.4.2
- Update :code:`py-solc-x` to 0.8.2

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- Fix bug where location offsets were incorrectly displayed in reports
- Fix bug where whitespace was incorrectly rendered in HTML reports
- Clean up HTML report layout template code
- Update :code:`click` to 7.1.2

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- Add property verification flag docs
- Add property checking flag to analyze command
- Update :code:`sphinx` to 3.0.3

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- Fix bug where new line characters were incorrectly sent on Windows OS
- Fix bug where group creation from config was not triggered
- Update :code:`sphinx` to 3.0.2
- Update :code:`coverage` to 5.1
- Update :code:`Jinja` to 2.11.2