cleanup Syntax changes.

[apps4u]

I wanted to help and I think to get to know a project its good to do a clean up and learn the code.
So this is a heap of code changes but Ive not changed the behaviour of the program, I've only made Syntax changes eg:
used Lambda instead of anonymous classes.
cleaned up some of the stream api usage.
add added a few Objects.requireNonNull.
and added a few missing @Suppress annotations.

Signed-off-by: Jason Kristian jasonk@apps4u.com.au

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Jason Kristian seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}