Finish Implementing Presets Backend about audio-visualizer-python HOT 3 CLOSED

All preset functionality should be working as of 2ad14b7. There are methods now for creating, deleting, renaming (saving+deleting), opening, clearing, exporting, and importing presets. Export and import use the same file format as project files (called avl instead of avp) and are used to transfer presets to other systems.

Only feature remaining to add is exporting and importing multiple presets in one avl file. The file format already supports doing this, and presets exported with this version will be forward compatible. So adding it to the backend will be simple, but a GUI dialog for selecting/deselecting presets out of an avl file must be designed.

The preset list must allow selection of multiple presets at once for bulk export and delete functions. Rename function will continue to use a single selection.

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@tassaron2 @rikai @djfun

Only feature remaining to add is exporting and importing multiple presets in one avl file.

Should we wait on implementing this until after we hit our first milestone? The only other issue is packaging and we are ready for testing.

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Yes, I agree we can wait to implement multiple preset functionality until a future milestone. At that time we can create a new issue.

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