Better handling of write permissions

[alem0lars]

At the moment, write permission is asked too many times.

For example in fizzy cfg edit it should be allowed to edit the files in read-only mode.

Steps

• [ ] Identify when we can get rid of requiring write permissions
• [ ] Don't require write permissions in that cases (maybe print a warning?)

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[alem0lars]

This issue should be solved considering issue #19