Add wxVector::operator==() and !=()

Make this class more consistent with std::vector<>.

interface/wx/vector.h

@@ -199,6 +199,20 @@ public:
     */
     wxVector& operator=(const wxVector& vb);
 
+    /**
+        Equality operator.
+
+        @since 3.1.1
+    */
+    wxVector& operator==(const wxVector& vb) const;
+
+    /**
+        Inequality operator.
+
+        @since 3.1.1
+    */
+    wxVector& operator!=(const wxVector& vb) const;
+
     /**
         Returns item at position @a idx.
     */