Provided soundboards should not be editable

[nbudzyn]

The soundboards that are automatically created from the provided sounds shall no longer be editable:

• Mark soundboards as provided
• The user should not be able to change the soundboard name
• The user should not be able to delete a provided soundboard
• Removing sounds from a provided soundboard shall be disabled in the playing view
• Removing or adding sounds shall be disabled in the sound edit view
• Add new tutorial hint to remove sound from custom soundboard
• Adjust the tutorial appropriately: Show specialized hints for first non-provided soundboard

This is especially important now that a user who does not give permission to
access local sounds without this feature will not be able to recover a provided sound after deleting it from all soundboards.

Sorting provided soundboards shall still be possible.