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Contains the logic for encoding every logical protocol field type
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FieldDescriptor) we construct two functions:  a "sizer" and an "encoder".  The
sizer takes a value of this field's type and computes its byte size.  The
encoder takes a writer function and a value.  It encodes the value into byte
strings and invokes the writer function to write those strings.  Typically the
writer function is the write() method of a BytesIO.

We try to do as much work as possible when constructing the writer and the
sizer rather than when calling them.  In particular:
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* Similarly, we try to do any attribute lookups at startup time if possible.
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* If a Python function lacks a return statement, Python actually generates
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