Add description to save stack effect dialog

We've modified the dialog used to save the new effect name to now accept the name and description.
If no description is provided, a yes/no dialog confirms with the user if it should be saved anyways.

Co-authored-by: Rafael Pereira <180108344@aluno.unb.br>

Co-authored-by: Felipe Agustini <felipeboccardi@hotmail.com>

Fixes #582