FrameBuffer creation flags replace booleans

Instead of many creation options (with alpha, with multisampling, etc) use a single flag with boolean operators. Creation of the new mipmap flag for FrameBuffer, rendering the current FBO into multiple sub-resolutions.

FrameBufferFilter.h

@@ -1,6 +1,7 @@
 #ifndef FRAMEBUFFERFILTER_H
 #define FRAMEBUFFERFILTER_H
 
+#include <sys/types.h>
 #include <glm/glm.hpp>
 
 class Visitor;