Add a limit to all Win32 message loops #28

This works around Waves plugins causing an infinite message loop. Since
we run the loop 30 times per second anyways splitting the loop up into
chunks of 20 shouldn't be an issue.

src/wine-host/editor.cpp

@@ -173,8 +173,12 @@ void Editor::handle_win32_events() const {
     MSG msg;
 
     // The null value for the second argument is needed to handle interaction
-    // with child GUI components
-    while (PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE)) {
+    // with child GUI components. So far limiting this to `max_win32_messages`
+    // messages has only been needed for Waves plugins as they otherwise cause
+    // an infinite message loop.
+    for (int i = 0;
+         i < max_win32_messages && PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE);
+         i++) {
         // This timer would periodically send `effEditIdle` events so the editor
         // remains responsive even during blocking GUI operations such as open
         // dropdowns or message boxes. This is only needed when the GUI is