Add HTTP "headers" to _quvi_s
Add HTTP "headers" to _quvi_s

This linked-list will hold any custom HTTP headers that should
be used with the outgoing HTTP requests.

Signed-off-by: Toni Gundogdu <eac2284b3c43676907b96f08de9d3d52d5df0361@gmail.com>

legatvs/libquvi,legatvs/libquvi,legatvs/libquvi