Add "Save Layout" to "Confirm Close" Dialogue

[touwys]

listFix() clears the Playlist Editor of all playlists upon closing — if the user chooses to discard changes made to the playlists. This action is available through the "Confirm Close" Dialogue.

A viable option here, would be to supplement the current actions in the "Confirm Close" Dialogue, with one that enables the user to preserve their current tabbed playlist layout until the app restart, when the saved playlist layout is automatically restored.

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[Borewit]

We can store the playlist editors when we close the application, and restore those when the application is started. I am not in favor to bother the user with extra questions / options on exit.

[Borewit]

First this issue / PR pair needs to be completed:

• Migrate .listFix()\positions.ini to JSON #54
• Save windows locations in JSON application configuration #112

as that migrates existing application state the the JSON configuration file.

[touwys]

We can store the playlist editors when we close the application, and restore those when the application is started. I am not in favor to bother the user with extra questions / options on exit.

I agree, it is superfluous. However, usually, this type of action would be made available as a programme option. (Maybe you could add that later on, as courtesy to the users who would prefer to start with a clean work interface?)