qcbor: upgrade 1.2 -> 1.3

License-Update: Update the LICENSE file from README.md to LICENSE

Changelog:
==========
- Floating-point conversion between half, single and double-precision for
  subnormal values and NaN payloads is completed. These are relatively obscure
  unused parts of IEEE754 floats.
- QCBOREncode_GetErrorState() can now be called after QCBOREncode_Finish() and
  it will always return the correct error.
- User-defined error codes are now supported. The error state can be set with
  the new function QCBORDecode_SetError().
- Fixed a rare condition where QCBORDecode_ VGetNext() would not set the
  Item.uDataType to QCBOR_TYPE_NONE on error.
- Function naming changed to better avoid name collision. This includes internal
  functions. This is to compensate for C not having name spaces like C++.
- Documentation correctly describes mixing of traversal cursor used by GetNext
  with fetch by label in entered maps
- Some increase in test coverage
- A bunch of "TODO:" items were addressed. Most result in no change to the code,
  just changes to documentation and test coverage.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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