Updating script to v1.3

- Implement _clearLines like AppleIntelFramebufferAzul.sh
- Implement _showDelayedDots like AppleIntelFramebufferAzul.sh
- Implement _invalidMenuAction like AppleIntelFramebufferAzul.sh
-  Implement _toLowerCase like AppleIntelFramebufferAzul.sh
- Option 'Exit' to menus added
- Improved layout of menus / styling added like
AppleIntelFramebufferAzul.sh