UI: Add missing data-block icons in Outliner

Add data-block icons to Outliner's "Blend File" mode for:

* Color Palette
* Particles System
*  Vector Font

Pull Request: https://projects.blender.org/blender/blender/pulls/117850

source/blender/editors/space_outliner/outliner_draw.cc

@@ -2555,6 +2555,12 @@ static BIFIconID tree_element_get_icon_from_id(const ID *id)
       return ICON_SEQUENCE;
     case ID_PC:
       return ICON_CURVE_BEZCURVE;
+    case ID_PA:
+      return ICON_PARTICLES;
+    case ID_PAL:
+      return ICON_COLOR;
+    case ID_VF:
+      return ICON_FILE_FONT;
     default:
       return ICON_NONE;
   }