feat: implemented annotations

src/main/java/ftbsc/geb/api/annotations/Event.java

@@ -0,0 +1,17 @@
+package ftbsc.geb.api.annotations;
+
+import ftbsc.geb.api.IEvent;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Marks a class as an Event. It should implement the {@link IEvent} interface.
+ * It doesn't need to be abstract, but it can never be final.
+ * @since 0.1.0
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.CLASS)
+public @interface Event {}

src/main/java/ftbsc/geb/api/annotations/Listen.java

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+package ftbsc.geb.api.annotations;
+
+import ftbsc.geb.api.IEvent;
+import ftbsc.geb.api.IListener;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Marks the method as a listener. Its parent must implement the {@link IListener} interface.
+ * The annotated method should only take a single input value, an instance of {@link IEvent};
+ * it should be either void or boolean; if it's boolean, the return value indicates whether
+ * the event was canceled.
+ * @since 0.1.0
+ */
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.CLASS)
+public @interface Listen {
+	/**
+	 * @return an integer indicating priority level for the listener, defaulting to 0
+	 */
+	int priority() default 0;
+
+	/**
+	 * @return an array of {@link String}s specifying which buses they should be listening on;
+	 * 				 an empty array means that they should listen on all buses, ignoring identifiers:
+	 * 				 that's probably what you wanted anyway.
+	 */
+	String[] on() default {}; //empty array = listen on all of them
+}

src/main/java/ftbsc/geb/api/annotations/ListenerInstance.java

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+package ftbsc.geb.api.annotations;
+
+import ftbsc.geb.api.IListener;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * This annotation should mark either be a static instance of {@link IListener}
+ * or a static method returning one.
+ * @since 0.1.0
+ */
+@Target({ElementType.FIELD, ElementType.METHOD})
+@Retention(RetentionPolicy.CLASS)
+public @interface ListenerInstance {}