Pano

- Support for metadata scan
- Removed `data_source` property from model files
- Connection is now project specific and there may not be multiple connections in one project

- Removed dependency on Panoramic API, fully standalone version
- Without support for metadata scan

- Bugfix for badly generated transform queries

- Introduces Pano Transforms
- A new `pano transform` command group
- A `pano transform create` command to help with transform file scaffolding
- A `pano transform exec` command to execute/compile transforms on top of a connection

- Implement anonymous usage metrics collections

- Introduce DBT subcommand to manage pre-model transforms
- Fix Homebrew install