Browser improvements, maths functions, db management, misc fixes...

[rewbs]

• Biquad filter available on reference audio.
• Loads of new maths functions and constants.
• Allow creating new doc from existing doc.
• Rework file browser UI: list all documents and drill down into versions for a given document.
• Add database management tools (import/export/clean/delete).
• Frame number now visible in grid even when locked to beats/seconds.
• Improve performance of load dialog.
• Fixes to Revert (prompts should now revert properly).
• Obvious Shortcut to edit final frame for those who thought Parseq was limited to 119 frames. :)

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 9891e27):

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