Add accessible events as defined by IAccessible2.

Additional events from:
http://accessibility.linuxfoundation.org/a11yspecs/ia2/docs/html/_accessible_event_i_d_8idl.html

Reviewed-by: Morten Sorvig
(cherry picked from commit 6bd74d66b418cad30ed5a448e657a7a5097eed4a)

src/gui/accessible/qaccessible.h

@@ -83,6 +83,42 @@ public:
 
         MenuCommand          = 0x0018,
 
+        // Values from IAccessible2
+        ActionChanged        = 0x0101,
+        ActiveDescendantChanged,
+        AttributeChanged,
+        DocumentContentChanged,
+        DocumentLoadComplete,
+        DocumentLoadStopped,
+        DocumentReload,
+        HyperlinkEndIndexChanged,
+        HyperlinkNumberOfAnchorsChanged,
+        HyperlinkSelectedLinkChanged,
+        HypertextLinkActivated,
+        HypertextLinkSelected,
+        HyperlinkStartIndexChanged,
+        HypertextChanged,
+        HypertextNLinksChanged,
+        ObjectAttributeChanged,
+        PageChanged,
+        SectionChanged,
+        TableCaptionChanged,
+        TableColumnDescriptionChanged,
+        TableColumnHeaderChanged,
+        TableModelChanged,
+        TableRowDescriptionChanged,
+        TableRowHeaderChanged,
+        TableSummaryChanged,
+        TextAttributeChanged,
+        TextCaretMoved,
+        TextChanged,
+        TextColumnChanged,
+        TextInserted,
+        TextRemoved,
+        TextUpdated,
+        TextSelectionChanged,
+        VisibleDataChanged,
+
         ObjectCreated        = 0x8000,
         ObjectDestroyed      = 0x8001,
         ObjectShow           = 0x8002,