Fixed Scrollbars not calculating their slider size properly based on the adjustment values, fixed ScrolledWindow sometimes displaying 2 scrollbars instead of only 1 when both are set to automatic and the child viewport is expanded, fixed OpenGL example not spinning as fast as intended because the clock was restarted twice per frame, fixed a few undefined behavior errors as reported by clang sanitizers, added Wsign-conversion to prevent sign conversion errors, changed to include libELL headers as system headers so that pragmas are no longer required to silence warnings.