Added support for OpenGL debug mode

When NzContextParameters.debugMode is true, Nazara will receive OpenGL's
debug message and send them to Nazara's log
NzString::Pointer now have the "0x" prefix
Added support for ARB_texture_storage extension
Nazara now try to load core texture 3D before trying to load
EXT_texture3D
Added NazaraNotice macro, writing raw text into Nazara's log
Added NzContext::Destroy (called in Create)

include/Nazara/Core/Log.hpp

@@ -16,6 +16,7 @@
 #include <Nazara/Core/ThreadSafety.hpp>
 
 #define NazaraLog NzLog::Instance()
+#define NazaraNotice(txt) NazaraLog->Write(txt)
 
 class NzFile;