A few minor code quality improvements

[AndyMacDroo]

Remove public identifiers from interfaces as they are redundant. Use List interface rather than ArrayList implementation in method signatures

[AndyMacDroo]

Hey @dmi3coder. Just did a few code quality improvements. Hopefully they don't cause any issues with their incorporation elsewhere. Let me know if any changes are needed 🙂

[coveralls]

Pull Request Test Coverage Report for Build 98

• 5 of 5 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.343%

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Totals
Change from base Build 96:	0.0%
Covered Lines:	306
Relevant Lines:	335

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💛 - Coveralls

[dmi3coder]

Good evening @AndyMacDroo! Thank you for PR, I wanted to refactor it a long time ago haha. Works fine, works also correctly on the mobile device, so I'll merge it and create a new release. It'll be better to stick to interfaces earlier :)
Also, I've made you as a contributor so I think you can push branches directly to this project, just use feature/${some_name} for new branches if you'll want to do something later. I can add some code to same branch this way :) But do it as you like, not an issue at all
Great job!

[AndyMacDroo]

Thanks Dmitriy 👍

I'll start feature branching from now on 🙂