Install libsdl-dev for testing.
Fixed compilation without HAVE_VIDEOGFX or HAVE_SDL.
Support compilation without libsdl (e.g. MinGW on Travis CI).
Include missing header files in distribution tarball.
added more logging options
fix QP changing within frame
Merge branch 'master' of https://github.com/strukturag/libde265
fixed variable QP with multithreading
only adjust QP once in each quantization-group for efficiency
update readme
Merge branch 'dirk'