Replace FPFSS edit popup with toast notification

[Seirade]

Is your feature request related to a problem? Please describe.
The current FPFSS edit workflow can be disruptive with the native popup box showing every time.

Describe the solution you'd like
Instead of a popup box with a "Success" message, it should be changed into a toast notification. Example:
https://www.w3schools.com/HOWTO/howto_js_snackbar.asp

It should come from the top of the window, and be colored according to the message. Green for success, and it goes away after a couple seconds. Yellow/red for warnings and errors, but instead of auto-dismissing, leave it open and have an X button to dismiss. Next to it can also be a "Copy to clipboard" button to allow messages to be copied for users asking for support, which eliminates the need to take a screenshot.

The notifications would also prevent stealing focus from the main window. As a bonus, they would also be visually consistent across OS platforms, and be theme-able. Or, if the need should arise, any other HTML can be added to create a nicer looking message.

Optional: This feature change could also introduce playing sounds, since it would probably be desirable to have 2 or 3 different ones depending on the message type, and that could also extend to other areas (hovering on elements, launching a game, splash screen/startup?).

Describe alternatives you've considered
N/A

Additional context
N/A