Make addon extensible and customizable

[mlopezFC]

Feature proposal

The addon is popular but it is impossible or very difficult to customize, replace or create a new exporter implementations. So it would be nice to modify the API in such a way that is possible to extend the functionality and create new implementations of different ways of exporting data from a grid.

Describe solution expectations

• Expose grid and other things as methods from GridExporter
• Make implementations of different exporters public
• Make implementations to be extensible
• etc.

Additional information

No response