Phablytics

- include [web] variant of phablytics
- include Flask in requirements_web.txt
- explicitly require minimum Python 3.0
- properly package *.html template files with distribution
- add HTML-formatted reports
- convert emoji aliases to unicode characters

- handles paginated results for Maniphest search

- filter out changes-planned, include needs-revision

- adds new dataclass ReportConfig to configure how reports should run
- all reports now work with ReportConfig
- adds report_name setting, which is a higher-level object than report_type
- multiple reports (with different report_names) can have different configurations using the same report_type
- updates differential revision search to include statuses of accepted, changes-planned, needs-review
- switches -r from --report_type to --report_name
- all Slack messages now support customizing username and emoji
- isort everything (switching to multi-line combo imports)
- updated README with some basic Get Started instructions

- split out reports into its own directory module and separate files

- use python-dotenv to read in env
- use settings.py in cwd
- various bug fixes