Set use rpath
Quote all CMake path arguments

Fixes #111
Use sddm.service as a file name in the source
Fix the CMake systemd regex
Merge pull request #176 from davidedmundson/rpath

Set use rpath
Merge pull request #175 from jleclanche/master

CMake quoting
Add support for display setup script
Add missing DISPLAY and XAUTHORITY env variables