Move the win32 window class name to a constant

src/wine-host/editor.cpp

@@ -40,6 +40,12 @@ using namespace std::literals::string_literals;
         }                                                               \
     } while (0)
 
+/**
+ * The name of the Win32 window class we'll use for the Win32 window that the
+ * plugin can embed itself in.
+ */
+constexpr char window_class_name[] = "yabridge plugin";
+
 /**
  * The Win32 timer ID we'll use to periodically call the VST2 `effeditidle`
  * function with. We have to do this on a timer because the function has to be
@@ -1231,7 +1237,7 @@ ATOM get_window_class() noexcept {
         window_class.lpfnWndProc = window_proc;
         window_class.hInstance = GetModuleHandle(nullptr);
         window_class.hCursor = arrow_cursor;
-        window_class.lpszClassName = "yabridge plugin";
+        window_class.lpszClassName = window_class_name;
 
         window_class_handle = RegisterClassEx(&window_class);
     }