fix: removed direct output to stderr and stdout in core library code

[akafredperry]

- What I did

• Removes direct output to System.out and System.err in core library code.
• Cleanup of examples module included

NOTE CLI classes have NOT been modified and neither has the examples module (to keep it simple)

closes #337

- How I did it

• Added project Lombok (this is a compile time library that removes the need for Java boiler plate and includes slf4j logging)
• Replaced all the instances in which the code was printing to System.out and System.err with log statements
• Replaced printStack trace statements with log statements

- How to verify it

- Description for the changelog
replaced direct output to stderr and stdout with slf4j logging in core library code