[m-rev.] for post-commit review: self-contained MLDS defns

[Zoltan Somogyi]

I have bootchecked this in hlc.gc, and checked to see that
it generates Java and C# code that is bit-identical to the
Java and C# code generated by my installed compiler
for every module in the compiler directory, but I would
still appreciate it if someone who knows the Java and/or C#
backends had a look.

I plan to tighten the representation of definitions further still;
I think the set of name schemas and flags that a definition may have
is different for different kinds of definitions.

Zoltan.
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