NaN rework to comply with ordinary serialization (still called prefer…

[laurencelundblade]

• Error codes for decoding conformance errors are refactored

• Compliance with draft-cbor-serialization for NaN processing

• • NaN payloads are not allowed in deterministic and preferred serialization
• • There no longer any shortest-length serialization of NaNs with payloads
• • NaN payloads are supported, but only for special use

• There are now special modes for encoding and decoding NaN payloads

• Floating point testing is refactored, particularly to make testing of decoding better

• QCBOREncode_AddDoubleNoPreferred() is deprecated in favor of QCBOREncode_AddDoubleRaw().