Schemachange

Added
- Support for "repeatable" scripts such as stored procedures, functions etc

Added
- Support for variables in change scripts (following a Jinja expression syntax)! See the [README](README.md) for more details.
- A new optional parameter `--vars` which accepts a JSON formatted string of variables and values (e.g. `{"variable1": "value1", "variable2": "value2"}`)

Changed
- Add the Snowflake account name to the script output to provide more log context

Removed
- Removed the deprecated `--snowflake-region` parameter. Instead use the `-a` or `--snowflake-account` account parameter. See [Usage Notes for the account Parameter (for the connect Method)](https://docs.snowflake.com/en/user-guide/python-connector-api.html#label-account-format-info) for more details on how to structure the account name.

Added
- Support for cross-database dependencies!
- Support for override the location and name of the change history table with the new parameter `--change-history-table` (or `-c`)
- Change log for snowchange project (this CHANGELOG.md file)

Changed
- The required project folder structure, removing the database folder convention
- Where the change history table gets created and how it gets named
- The schema of the change history table (removed INSTALLED_RANK and renamed/reordered a few columns)
- Updated the getting started section of the README.md to make the getting started steps more clear

Removed
- The ability for snowchange to create user databases directly (now the user must explicity do so in their change scripts)
- The `--environment-name` and `--append-environment-name` parameters