Copied from #4255 by @hzyitc - added shellfmt and .editorconfig for consistency

Description

I notice that the first commit of armbian-next contains too many things (armbian-next: huge refactor, shellfmt, codesplit, logging/error handling). It's really hard to find out what changes we do, because we both split /lib/*.sh and change the code in one commit. It will loss the association between master and armbian-next.

This PR is just split /lib/*.sh without changing any codes (except the first commit and the remove of source in /lib/main.sh). So users can find out where the codes come and then following the original commit log.

If we want to merge armbian-next, this PR can make us more easily to find out the differentiation and review.

If we don't merge armbian-next, this PR can let us have a more clearing structure.

And it change nothing, so it still work well.

Note: Please just Create a merge commit instand of Squash and merge. So the commit logs can be kept.

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