Add libcbor 0.5.0

libcbor is a C library for parsing and generating CBOR, the general-purpose
schema-less binary data format.

Main features:

• Complete RFC conformance
• Robust C99 implementation
• Layered architecture offers both control and convenience
• Flexible memory management
• No shared global state - threading friendly
• Proper handling of UTF-8
• Full support for streams & incremental processing
• Extensive documentation and test suite
• No runtime dependencies, small footprint

WWW: http://libcbor.org/