This adds enough support for SET { ... } types to the template backend
to allow the X.690 sample test to be run with the template backend.
Limitations:
- For DER encoding, the SET { ... } members must be manually sorted by
the module author.
- Decoding of out-of-order encodings (BER) is not supported at this
time.
These shortcomings will be addressed later.
Note that because we don't parse IMPORTed modules at this time, we can't
sort SET { ... } members at compile time if any of them out an
outer-most tag that the compiler cannot see without learning to parse
IMPORTed modules.
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