Add: Clear screen opcode and test
Change: Chip8 class
Change: Main starts the monitor
Clean: Removed unused imports.
Add: Keyboard functionality.
Change: Add IOManager instance to Monitor.
Add: Basic monitor functionality.
Add: Basic monitor functionality.
Change: Improve monitor functionality.
Add: Load program and exit functionality.
Add: Error dialog for Load program.
Add: More comments to IOManager.
Improve opcode method calls