Analytix

Added helper functions for retrieving report types:

- `.get_report_type()`
- `.get_verified_report_type()`

Fixed a bug where JSON reports could not be created.

- Added playlist report type support.
- If no specific report type could be determined, analytix now falls back to a basic user activity report.
- A few minor efficient enhancements.

- Fixed ordering issue.

- Fixed an issue with report type that have required and optional dimensions.
- Fixed some stuff in the docs.

- Corrected some bugs in rc1.
- Added some extra verification.
- Made some messages look a little nicer, especially some error messages.
- Made it impossible to install on unsupported versions.
- Corrected some issues in the docs.