Add interface representing all callbacks the client does, and convert mixins to use it

This allows creating and injecting Hooks via guice

runelite-api/src/main/java/net/runelite/api/Client.java

@@ -33,15 +33,30 @@ import javax.annotation.Nullable;
 import net.runelite.api.annotations.VisibleForDevtools;
 import net.runelite.api.coords.LocalPoint;
 import net.runelite.api.coords.WorldPoint;
+import net.runelite.api.hooks.Callbacks;
 import net.runelite.api.vars.AccountType;
 import net.runelite.api.widgets.Widget;
 import net.runelite.api.widgets.WidgetInfo;
+import org.slf4j.Logger;
 
 /**
  * Represents the RuneScape client.
  */
 public interface Client extends GameEngine
 {
+	/**
+	 * The client invokes these callbacks to communicate to
+	 * @return
+	 */
+	Callbacks getCallbacks();
+
+	/**
+	 * Retrieve a global logger for the client.
+	 * This is most useful for mixins which can't have their own.
+	 * @return
+	 */
+	Logger getLogger();
+
 	/**
 	 * Gets a list of all valid players from the player cache.
 	 *

runelite-api/src/main/java/net/runelite/api/hooks/Callbacks.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2018, Adam <Adam@sigterm.info>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.runelite.api.hooks;
+
+import java.awt.Graphics;
+import java.awt.event.KeyEvent;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseWheelEvent;
+import net.runelite.api.MainBufferProvider;
+
+/**
+ * Interface of callbacks the injected client uses to send events
+ */
+public interface Callbacks
+{
+	/**
+	 * Post an event. See the events in net.runelite.api.events
+	 * @param event
+	 */
+	void post(Object event);
+
+	/**
+	 * Post a deferred event, which gets delayed until the next cycle
+	 * @param event
+	 */
+	void postDeferred(Object event);
+
+	/**
+	 * Called each client cycle
+	 */
+	void clientMainLoop();
+
+	void updateNpcs();
+
+	void drawRegion();
+
+	void drawAboveOverheads();
+
+	void draw(MainBufferProvider mainBufferProvider, Graphics graphics, int x, int y);
+
+	MouseEvent mousePressed(MouseEvent mouseEvent);
+
+	MouseEvent mouseReleased(MouseEvent mouseEvent);
+
+	MouseEvent mouseClicked(MouseEvent mouseEvent);
+
+	MouseEvent mouseEntered(MouseEvent mouseEvent);
+
+	MouseEvent mouseExited(MouseEvent mouseEvent);
+
+	MouseEvent mouseDragged(MouseEvent mouseEvent);
+
+	MouseEvent mouseMoved(MouseEvent mouseEvent);
+
+	MouseWheelEvent mouseWheelMoved(MouseWheelEvent event);
+
+	void keyPressed(KeyEvent keyEvent);
+
+	void keyReleased(KeyEvent keyEvent);
+
+	void keyTyped(KeyEvent keyEvent);
+}