Keymap conflict detection operator.

Takes into account the hierarchical structures of keymaps as well as wildcards (KM_ANY) in event definitions, user remaps (emulate numpad, action/select mouse buttons, ...) and event values that overlap (click, press and release)

For now, doesn't do anything other than print conflicts in the console.

As a result, I cleaned up a lot of keymaps that had double definitions, moved some keymap items in more appropriate places, fixed wrong definitions and removed kmi that were added for testing a long long time ago.

Out of all the remaining conflicts, after removing obvious non-issues, here's what remains: http://www.pasteall.org/9898

source/blender/makesrna/intern/rna_wm_api.c

@@ -288,5 +288,16 @@ void RNA_api_keymap(StructRNA *srna)
 	RNA_def_property_flag(parm, PROP_REQUIRED);
 }
 
+void RNA_api_keymapitem(StructRNA *srna)
+{
+	FunctionRNA *func;
+	PropertyRNA *parm;
+
+	func= RNA_def_function(srna, "compare", "WM_keymap_item_compare");
+	parm= RNA_def_pointer(func, "item", "KeyMapItem", "Item", "");
+	RNA_def_property_flag(parm, PROP_REQUIRED);
+	parm= RNA_def_boolean(func, "result", 0, "Comparison result", "");
+	RNA_def_function_return(func, parm);
+}
 #endif