Allow duplicate names in the name section (#512)

While this was previously allowed, it would result
in an invalid wast file since mutliple functions
would end up with the same name.

When generating labels we now add a unique numeric
suffix (.1, .2 etc) a la llvm-link.

We could add magic behaviour to strip these out
again when producing the name sectio in wast2wasm
which would allow for cleaner roundtrip, but might
cause confusion/issues for those who might want
to legitimately name their functions with such
suffixes.

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