Implement Screen capturing

[ByteOtter]

What?

Implement logic to capture screenshots of the remote machine.

Todo:

• [ ] Currently, due to how VNC works, subsequent calls of the read_screen function only return the delta between the current and the previous view. This has to change to include a full picture.
• [x] Document code
• [x] Improve Error handling
• [x] Remove/Change print calls
• [x] Fix clippy warnings
• [x] Add static type annotations

[ByteOtter]

This is now covered by #8