refactor(HandlingEditor): full rewrite

[xesdoog]

• Expose every flag currently available in the project's reversals.
• Replace the old test features with presets that can be extended by the user.
• Split the UI into two parts:
  • Editor Tab:
    • Lists all available flags while reflecting real time memory state (as opposed to config vars before). This is where new custom presets can be created.
    • Blocks interactions with flags owned by one or more active presets.
  • Presets Tab:
    • Provides a conjoined list of default and user-defined presets. Each preset can be toggled on/off or set to be automatically managed by the script.
    • Custom presets can optionally define additional logic that can be executed at runtime on preset enable/disable in a separate user-created file placed in the project's source; preferably inside the /includes/data folder (filename must be unique).
    • User-generated presets can be exported/imported via clipboard (Export copies preset data to clipboard, import pastes from it). Logic file must be manually provided, otherwise when imported, the preset will skip callback assignments.