In some situations (like VFS or other abstractions), the file reference can
have an invalid or unusabe path. Passing the GFile instead and opening it
directly increases probability we can actually access it.
* Store avatars in the user's cache directory.
- Not anymore in ~/.local/share, where media files are stored.
- Already existing ~/.local/share/dino/avatars directory will be
moved to ~/.cache/dino/avatars
- If both directories already exists, the old one (in
~/.local/share) is removed.
* Simplify old-to-new-location logic
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Co-authored-by: fiaxh <git@lightrise.org>
