Add wxGrid::Enable{Row,Col}Resize()

These functions are needed to allow resizing the rows/columns whose size
was fixed by Disable{Row,Col}Resize() as otherwise the effect of a call
to the latter function can't be undone at all.

interface/wx/grid.h

@@ -4655,6 +4655,17 @@ public:
     */
     void DisableHidingColumns();
 
+    /**
+        Enable interactively resizing a column if it was previously forbidden.
+
+        Calling this function only makes sense if the row resizing had been
+        previously forbidden using DisableColResize(), as it simply undoes its
+        effect.
+
+        @since 3.3.0
+     */
+    void EnableColResize(int col);
+
     /**
         Enables or disables cell dragging with the mouse.
     */
@@ -4726,6 +4737,17 @@ public:
     */
     bool EnableHidingColumns(bool enable = true);
 
+    /**
+        Enable interactively resizing a row if it was previously forbidden.
+
+        Calling this function only makes sense if the row resizing had been
+        previously forbidden using DisableRowResize(), as it simply undoes its
+        effect.
+
+        @since 3.3.0
+     */
+    void EnableRowResize(int row)l
+
     /**
         Returns the column ID of the specified column position.
     */