2.5

WIP commit for new system to draw widgets and use themes or styles.

Not really interesting stuff to see in code now, the current 
structure will change quite a lot, this to make it hook up well
to the existing system.

What works quite well is a new full opengl vector method to draw 
scalable and pixel-aligned anti-aliased buttons.

http://download.blender.org/institute/rt3.jpg
http://download.blender.org/institute/rt4.jpg

source/blender/editors/interface/interface_layout.c

@@ -846,6 +846,9 @@ void ui_layout_end(const bContext *C, uiBlock *block, uiLayout *layout, int *x,
 
 	if(x) *x= layout->x;
 	if(y) *y= layout->y;
+	
+	/* XXX temp, migration flag for drawing code */
+	uiBlockSetFlag(block, UI_BLOCK_2_50);
 }
 
 void ui_layout_free(uiLayout *layout)