graphics: remove unnecessary computation.
graphics: remove Setting argument from init().
graphics: Camera::matrix method returns rotation only if needed.
graphics: add new GraphicsOption parameter.
graphics: added target and level to texture creation.
graphics: set graphics option per form.
graphics: introduce shortcut method to set graphics options.
graphics: flip image vertically.
core: more usage of SAFE_DELETE macro.
code: use typedefed types.
graphics: respect the given size by creation of a cube.
graphics: replace deprecated gl_FragColor with own out variable.
graphics: don't exit if attrib couldn't be set.
graphics: rename private variable from m_txt to m_tex.
graphics: consider the set options in the form rendering.
graphics: implement skyBox.
demo: some refactoring considering the last changes.
code: add a todo item.
math: make matrix printable.