Memory warning when loading files via CommonsExtension

[trnstlntk]

Often, when starting a new project via the CommonsExtension, OpenRefine will warn about memory issues in big red angry words.

The project is usually not that large, though.

[trnstlntk]

This issue is not specific to the Commons Extension but happens in OpenRefine generically. See OpenRefine/OpenRefine/issues/5218. I'll leave this open for now though.