client-conf: rework - add set_cookie
context: add docu + use client_conf_set_cookie
def.h: add #define PA_COOKIE_LENGTH 256
client-conf-x11: coding style
client-conf: renamed pa_client_conf_parse_cookie_file => parse_cookie_file
client-conf: remove duplicated code
client-conf: improve docu
module-tunnel-sink-new: fix stream_name
module-tunnel-sink-new: removed PA_PROP_MEDIA_ROLE
module-tunnel-sink-new: change debug message ContextFailed
module-tunnel-sink-new: coding style
context: be consistance with client_conf function names
module-tunnel-sink-new: reworked bufferattr handling
module-tunnel-sink-new: improve comments + coding style + fixed typo in pa_stream_flags