[feature] Create a "report" for app shortcuts

[johseb]

Hi,
It would be great if KeyClu could create a plain text file listing all the shortcut of an app (even better a table in one of the many markdown dialects). Essentially the same content of the panel but saved in a file.
The creation of the document could be triggered using a button at the bottom of the panel.
I think it wold be useful when reorganizing shortcuts of an app that has a lot of them and you have to check which combinations are already taken, the associated menu items, etc.