InputManager: C++-style type definitions.

There is no need to typedef enums and structs in C++.
Put types defined by InputManager inside the class namespace.
Changed type names to CamelCase.

src/menusettingmultistring.h

@@ -45,7 +45,7 @@ public:
 			const std::vector<std::string> *choices);
 	virtual ~MenuSettingMultiString() {};
 
-	virtual bool manageInput(bevent_t *event);
+	virtual bool manageInput(InputManager::ButtonEvent *event);
 };
 
 #endif