Updated specfile following feedback from Fedora review

* expanded contents of docs subpackage
* removed unnecessary attr in %files
* removed all %if 0%{?rhel}
* removed unnecessary BuildRequires/Requires
* Updated Source0 URL

Updated CMakeLists

* Put contents of docs into separate package
* Removed obsolete README from src/lib, src/server
* Added macro to determine lib/lib64 path
* Created separate docs/CMakeLists