Refactored version

• Refactored the Java code.
• Applied serial communication port checks in Java Code.
• Added a Arduino Java class to have all Arduino related values at one place.
• Optimized the Arduino code to handle everything based on FIRST_PIN and MAX_PIN values instead of hardcoding everything. This even allows it now to change the FIRST_PIN value to something different than 2.
• Added a offset functionality in the Java code to support the change of the FIRST_PIN value.

Initial version

This is the initial version forked from SammyIAm's master branch.