review style of ChainProducer modules + add license header

[KtorZ]

Issue Number

#12

Overview

• I have adjusted a few module to be more compliant with our coding standards
• I have removed unecessary SlottingOrphans module in order to keep spec file self-contained. Ideally, and will do that in another PR, we want to move the slotting stuff to within the wallet primitives there's no need for a separate module here.
• I have added some license headers to files when it was missing, we haven't quite set any coding standard on that, so that is subject to debate, but it gives nice doc and, ideally, come with a description of what the module does.

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