Call Window.onFramebufferSizeChanged to resize (fixes #705)

Instead of setting the the values via accessor and calling the handler directly.
This allows mods like ResolutionControl+ to properly resize its internal
framebuffers as well.

src/main/java/com/replaymod/render/gui/progress/VirtualWindow.java

@@ -56,12 +56,14 @@ public class VirtualWindow implements Closeable {
         gameHeight = acc.getFramebufferHeight();
         acc.setFramebufferWidth(framebufferWidth);
         acc.setFramebufferHeight(framebufferHeight);
+        applyScaleFactor();
         isBound = true;
     }
 
     public void unbind() {
         acc.setFramebufferWidth(gameWidth);
         acc.setFramebufferHeight(gameHeight);
+        applyScaleFactor();
         isBound = false;
     }
 

src/main/java/com/replaymod/render/mixin/MainWindowAccessor.java

@@ -15,4 +15,6 @@ public interface MainWindowAccessor {
     int getFramebufferHeight();
     @Accessor
     void setFramebufferHeight(int value);
+    @Invoker
+    void invokeOnFramebufferSizeChanged(long window, int width, int height);
 }