Add direct upload to YouTube support

src/main/java/com/replaymod/extras/youtube/YoutubeUpload.java

@@ -0,0 +1,35 @@
+package com.replaymod.extras.youtube;
+
+import com.replaymod.core.ReplayMod;
+import com.replaymod.extras.Extra;
+import com.replaymod.render.gui.GuiRenderingDone;
+import de.johni0702.minecraft.gui.container.GuiScreen;
+import de.johni0702.minecraft.gui.element.GuiButton;
+import net.minecraftforge.client.event.GuiScreenEvent;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+
+public class YoutubeUpload implements Extra {
+    @Override
+    public void register(ReplayMod mod) throws Exception {
+        MinecraftForge.EVENT_BUS.register(this);
+    }
+
+    @SubscribeEvent
+    public void onGuiOpen(GuiScreenEvent.InitGuiEvent.Post event) {
+        if (GuiScreen.from(event.gui) instanceof GuiRenderingDone) {
+            GuiRenderingDone gui = (GuiRenderingDone) GuiScreen.from(event.gui);
+            // Check if there already is a youtube button
+            if (gui.actionsPanel.getChildren().stream().anyMatch(it -> it instanceof YoutubeButton)) {
+                return; // Button already added
+            }
+            // Add the Upload to YouTube button to actions panel
+            gui.actionsPanel.addElements(null,
+                    new YoutubeButton().onClick(() ->
+                            new GuiYoutubeUpload(gui, gui.videoFile, gui.videoFrames, gui.settings).display()
+                    ).setSize(200, 20).setI18nLabel("replaymod.gui.youtubeupload"));
+        }
+    }
+
+    private static class YoutubeButton extends GuiButton {}
+}