Policy-sentry

Developers can now leverage Policy Sentry as a python package without needing to build the database from the html docs. Just use `db_session = connect_db('bundled')` before passing in commands that require the db_session and you're ready to go. Also moved to a saner subfolder structure

Broke up the guts of `get_actions_from_policy_file` in the `shared/analyze.py` file to a separate function, `get_actions_from_policy` so we can use this outside of Policy Sentry. See the `test_analyze_by_access_level` unit test in `tests/test_analyze.py` for an example.

* Added `--fetch` argument to `policy_sentry initialize` command.
* Fixed scraping process because AWS changed their documentation
* `overrides-resource-policies.yml` to specifically identify API calls that modify resource based policies.

New features:

* Analyze functionality now creates a comprehensive report (CSV and raw JSON, and optionally markdown) of IAM actions allowed per policy across multiple risk categories
* Analyze functionality can recursively analyze hundreds of downloaded IAM policies for allowed actions and include that in the report
* Report functionality supports custom report configuration, exclusion of roles to filter out false positives.
* HTML docs refresh for newer AWS services.
* download-policies now has the option to recursively download all IAM policies from accounts listed in your AWS credentials file. You can authenticate to all your accounts using a tool like Gossamer, then use this new feature to download all of the policies automagically for local analysis.

Breaking changes:
* Analysis folder is changed to ~/.policy_sentry/analysis (instead of ~/.policy_sentry/policy-analysis)
* `analyze-iam-policy` is now `analyze`

* **Fixed issue where initialize was not working due to db_session being declared outside of a function. This only applied to the last release.**
* Analyze command: Added credentials-exposure.txt audit file
* Fixed some stuff in the documentation that had old errors.
* Version bump
* HTML Documentation update approach (Fixes GH-23)
* `get_links.py` and other util scripts are now updated. We no longer have to maintain the big list of service-to-html-names.
* Missing services are now fixed by this HTML documentation update approach:
- applicationinsights
- appmesh
- appmesh-preview
- backup-storage
- chatbot
- codestar-notifications
- dataexchange
- ec2-instance-connect
- iotthingsgraph
- mediapackage-vod
- managedblockchain
- personalize
- rdsiamauthentiation
- savingsplans
- pinpointemailservice
- workmailmessageflow
- Marketplace links:
- Marketplace catalog
- Marketplace Entitlement Service
- Marketplace Image Building Service
- Marketplace Procurement systems integration
- Private Marketplace

* Query the IAM database directly via CLI using `policy_sentry query action-table`, `policy_sentry query arn-table`, or `policy_sentry query condition-table`
* Policy writing CRUD mode now supports actions that cannot restrict according to specific ARNs, like `s3:CreateBucket`, or `secretsmanager:CreateSecret`
* Other bug fixes, documentation improvements, and cleanup activities.
* See documentation on https://policy-sentry.readthedocs.io/en/latest/