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

This allows creating and injecting Hooks via guice

runelite-mixins/pom.xml

@@ -52,6 +52,12 @@
 			<artifactId>guava</artifactId>
 			<scope>provided</scope>
 		</dependency>
+		<dependency>
+			<groupId>javax.inject</groupId>
+			<artifactId>javax.inject</artifactId>
+			<version>1</version>
+			<scope>provided</scope>
+		</dependency>
 	</dependencies>
 
 	<build>