Make 'Save' button in settings keep track of changes

[PhAzE-Variance]

Is your feature request related to a problem? Please describe.
Some buttons in the UI, such as the SAVE icon don't have any UI changes when hovered over or clicked on. This means you click it to save your settings but have no visual idea if the settings were in fact saved.

Describe the solution you'd like
It would be nice to be able to see the button was clicked with a hover and click icon change. Also, potentially have a notification popup upon successful or failed save action. Similar should be done for anything clickable in the UI.

Additional context
N/A

[Casvt]

The only button that I can think of that doesn't directly show anything visual is the save button in the settings.

It's planned to keep track of changes in the settings and set the button title and colour based on that. E.g. 'No changes' and white, '1 change' and yellow + warning when you leave page without saving.