Decaf src

[confused-Techie]

This PR keeps with our overall goal of removing CoffeeScript everywhere we find it.

In this PR I'll focus on the decaf work of the src directory, to ensure we don't attempt to decaf both the specs and source at the same time.

And keeping with our guidelines of decaf work, I've first created a branch machine-decaf-source which contains the pure unadulterated machine decaf work. Work we know will work without issue. Then in this branch manual-decaf-source are my changes to prettify and ensure the decafed code is usable.

This methodology allows easy review of my actual changes, with a smaller diff. If/when this PR is merged into machine-decaf-source then that branch will be merged into master without review to get our decaf work there.

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Due to the way many classes are exported, this leaves a significant amount of formatting that needs to be changed, without any content changes. I'll do my best to keep formatting commits separate from content changes to provide the largest ease in review, if done commit by commit.

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All source decaf work is done, the majority of the files haven't seen much change.
But the diffs of chunked-line-reader and path-filter are rather difficult to review.
This is because those files underwent significant reformatting after removing their initClass and syntax sugar around them.
For those two files I'd recommend looking at the commit history to see how they were modified instead.