UI

* Added SCROLL button type, use like a NUMSLI basically, with
  a1 used to define the scroller size.
* Add scroll and toggle colors to the Theme (toggle was set to
  draw like radio in a recent commit, but it's the intention
  these look different).
* Added rudimentary list template, used for object material
  slots, this is WIP though.
* In popup menu, split text with line breaks over multiple
  lines, makes python errors display slightly nicer.

source/blender/editors/interface/interface_utils.c

@@ -120,6 +120,8 @@ uiBut *uiDefAutoButR(uiBlock *block, PointerRNA *ptr, PropertyRNA *prop, int ind
 			if(!pptr.type)
 				pptr.type= RNA_property_pointer_type(ptr, prop);
 			icon= RNA_struct_ui_icon(pptr.type);
+			if(icon == ICON_DOT)
+				icon= 0;
 
 			but= uiDefIconTextButR(block, IDPOIN, 0, icon, name, x1, y1, x2, y2, ptr, propname, index, 0, 0, -1, -1, NULL);
 			break;