Remove the `hmm` haxelib dependency from the build.
Linking to `hmm` caused `utest` to be transitively linked, which
eventually caused OpenFL to act strangely and instatiate the
application twice on the HTML5 target.
`hmm` was only used for `HaxelibVersions.getLibraryVersions` macro
call. Instead, manually parse the `hmm.json` ourselves to avoid
the dependency. This fixes the HTML5 target.
`hmm` is still used for package management, but no longer linked
in to the build itself.
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