Outliner: Display buttons to edit library override properties

As proposed in T95802, this adds buttons to a new column on the right to modify
the override in the Library Override display mode. Some further usability
improvements are planned. E.g. this does not yet expand collections (modifiers,
constraints, etc) nicely or group modified properties of a modifier together.
Vector properties with more than 3 items or matrices aren't displayed nicely
yet, they are just squeezed into the column. If this actually becomes a problem
there are some ideas to address this.

Differential Revision: https://developer.blender.org/D14268

source/blender/editors/include/UI_interface.h

@@ -1610,6 +1610,14 @@ uiBut *uiDefAutoButR(uiBlock *block,
                      int y,
                      int width,
                      int height);
+void uiDefAutoButsArrayR(uiBlock *block,
+                         PointerRNA *ptr,
+                         PropertyRNA *prop,
+                         const int icon,
+                         const int x,
+                         const int y,
+                         const int tot_width,
+                         const int height);
 /**
  * \a check_prop callback filters functions to avoid drawing certain properties,
  * in cases where PROP_HIDDEN flag can't be used for a property.