Updated SFML to the latest release (very small changes)
Relative includes
Switched to CMake
Removed tween experiments
Updated readme
Renamed experimental/ folder -> tests/,
Correctly renamed files that bothered qmake before (boo!),
changed again CMake file retrieving method
Removed OpenGL3 tests (will come later)
Tested layout on window resize (still very basic)
Disabled executable_output_path until I find why QtCreator randomly fails to find it