* Build both a legacy and modern browser compiler
* Dynamic import example and documentation
* Update the docs to use the modern browser compiler if the browser supports it
* Update policy regarding Stage 3 features
* This never made sense, and assigning a string to index 0 *of a string* throws in Module mode (and silently does nothing in Script mode) so remove this unneeded code that throws when compiling `fn for i from from iterable` in Module mode
* Have browser-based tests use the ES module version if supported
* Simplify building logic
* Update output
* For the ES module version of the browser compiler, don't automatically attach the runScripts event handler
* Consistent comments
* Fix comment
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