[Add] BotCode 增加用于操作机器人功能代码的工具类;

[Add] BotEventHandler, MessageEvent 将CQPluginMain消息处理部分迁移至BotEventHandler;
[Add] SpringCQMessageEvent, MiraiMessageEvent 增加两个消息事件实现;
[Add] MiraiMain 增加对 Mirai 框架的支持;
[Add] Main 增加 Mirai 框架的支持;

src/main/java/net/lamgc/cgj/bot/event/MessageEvent.java

@@ -0,0 +1,33 @@
+package net.lamgc.cgj.bot.event;
+
+import net.lamgc.utils.event.EventObject;
+
+public abstract class MessageEvent implements EventObject {
+
+    private final long fromGroup;
+    private final long fromQQ;
+    private final String message;
+
+    public MessageEvent(long fromGroup, long fromQQ, String message) {
+        this.fromGroup = fromGroup;
+        this.fromQQ = fromQQ;
+        this.message = message;
+    }
+
+    public abstract int sendMessage(final String message);
+
+    public abstract Object getRawMessage();
+
+    public long getFromGroup() {
+        return fromGroup;
+    }
+
+    public long getFromQQ() {
+        return fromQQ;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+}