Make some maps unordered to improve performance

* This permit to improve performance on C++11 builds
* use some existing typedefs in tools maps
* minor code style changes

src/settings.h

@@ -24,7 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/string.h"
 #include "threading/mutex.h"
 #include <string>
-#include <map>
+#include "util/cpp11_container.h"
 #include <list>
 #include <set>
 
@@ -45,7 +45,7 @@ typedef std::vector<
 	>
 > SettingsCallbackList;
 
-typedef std::map<std::string, SettingsCallbackList> SettingsCallbackMap;
+typedef UNORDERED_MAP<std::string, SettingsCallbackList> SettingsCallbackMap;
 
 enum ValueType {
 	VALUETYPE_STRING,