New fields/flags and semantics for GHCJS

[Luite Stegeman]

One more thing I had forgotten to mention, and still need to implement in
GHCJS:

If a library has web assets, for example CSS files or images for a GUI
framework library, they should be listed under `data-files` of a package.
The compiler then makes all data directories of dependencies available in a
subdirectory of the directory containing the generated JavaScript and HTML
files. Libraries then use their own "Paths_packagename" module to find the
location. Location should probably be based on the package key, not the
package version, so this requires #2194 to be resolved first.
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