feat(Detection): WM and WM Theme Detection

[KittyKatt]

Needed to mirror screenFetch functionality.

Detect currently running WM and theme.

Needs:

• [ ] Linux/BSD./UNIX WM detection
• [ ] Port theme detection from screenFetch and improve to match current guidelines
• [ ] DE-less and with DE logic
• [ ] Theme-less WM logic
• [ ] Windows/macOS logic
• [ ] Shorthand logic
• [ ] Testing

Questions:

• Do we want to split off different detection blocks into separate library files?
• Do we want to split off individual WM theme detection methods into separate library files?