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?