Merge branch 'adv-merge'

Move the entire contents of wxAdv library into wxCore.

In the future, wxAdv will disappear entirely, but for now keep it as an
empty placeholder to allow the existing make/project files to work.

See https://github.com/wxWidgets/wxWidgets/pull/900

interface/wx/treelist.h

@@ -50,7 +50,7 @@ enum
 
     @see wxTreeListCtrl
 
-    @library{wxadv}
+    @library{wxcore}
     @category{ctrl}
 
     @since 2.9.3
@@ -79,7 +79,7 @@ public:
 
     @see wxTreeListCtrl
 
-    @library{wxadv}
+    @library{wxcore}
     @category{ctrl}
 
     @since 2.9.3
@@ -255,7 +255,7 @@ extern const wxTreeListItem wxTLI_LAST;
         if you need to know it.
     @endEventTable
 
-    @library{wxadv}
+    @library{wxcore}
     @category{ctrl}
 
     @since 2.9.3