Customn sidecars

[v0.61.0] - 20230725

Added

• --sidecar-template option to export to allow user to specify one or more Mako templates for creating custom sidecars. See [example](https://github.com/RhetTbull/osxphotos/blob/main/examples/custom_sidecar.mako for an example)

Removed

Changed

• Added user_sidecar field to all report formats. This means that if you are using a CSV report with --append, you should archive your current report and create a new one which will include the correct headers. For JSON reports, the JSON outpput will simply include a new key for new records. For SQLite reports, the report table will be altered to add the new column.

Contributors

• @RhetTbull - Code and testing
• @neilpa - The idea for custom sidecars