Fixed clang compiler flags.
Fixed static linking and added support for static runtime library.
Fixed a bug where the Renderer would compute wrong texture coordinates because atlas page sizes weren't maximal, minor performance improvements to VB and VA Renderers.
Fixed minor graphical bug in BREW::CreateBorder().
Fixed ComboBox trying to select entries with a negative index (GitHub issue #2), added quotes to CMakeLists.txts where strings with spaces might occur (GitHub issue #5), deferred Signal emission until the end of HandleEvent to allow proper exception propagation without messing up Widget states.