empty config_site_cmake.h, note this file should be empty if you not using cmake to not disturb other build types such as autoconf! If you use cmake, this file will be auto generated from config_site_cmake.in.h template
add cmake based config_site
include cmake-based config_site into main config_site.h
add option to advertise RTCP in SDP, option to use SSL, configure cmake-based config_site, install steps
fix errata
add headers to files list, add install steps