liboauth 1.0.0

liboauth is a collection of POSIX-c functions implementing the
OAuth Core RFC 5849 standard. liboauth provides functions to
escape and encode parameters according to OAuth specification
and offers high-level functionality to sign requests or verify
OAuth signatures as well as perform HTTP requests.

Closes #16448.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>