Comments should be preserved, not removed

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Comments are removed by the preprocessor, and cannot currently be parsed by pycparser eliben/pycparser#102 Ignoring comments. This therefore has the same underlying cause as #1 Preprocessor constants should be preserved, not expanded.

Idea for how to fix these issues: change the design of transpile-c-to-js to not write out the JavaScript from the AST — instead, have it parse C into the AST, and manipulate the C source as text to make it valid JavaScript, rewriting the C constructs to JS. Since JS is a C-style language, it won't have to be completely rewritten. And we do want to preserve the syntactical structure and style of the source code as much as possible.

Mainly transpile-c-to-js's task would be to find the character ranges of C types, and remove/replace them with JS let, function, arguments, operators, declarations, and so on — keeping everything else mostly intact. For GH-1, may also need to instrument a C preprocessor, to replace #define FOO 1 with const FOO = 1;; as this knowledge is lost when the original source is piped to cpp, then analyzed by pycparser.

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Like https://news.ycombinator.com/item?id=11704472

Rather than manipulating the AST, Bublé manipulates the source code directly, using the AST as a guide – so there's no costly code generation step at the end.