Add more granular blur modifications

[LuminarySage]

I think the blur settings should be split into more values such as --messages-blur, --sidebar-blur, etc.
I would love to be able to have a transparent background with no blur but with the messages blurring the app background image for example

[CapnKitten]

I can do something like that in the next update. By default, both blur variables will still use --app-blur so it doesn't mess with people's custom themes.

[CapnKitten]

After looking into it, I don't think it's a wise decision to have multiple areas like that have their own pseudo elements that are blurred. It adds way too much lag to the theme for it to be useable. Animations like opening the user settings screen causes my cpu usage to shoot up to 15% on a Ryzen 5 2600; can't imagine what it'd be like on a system that uses a weaker cpu.