[Add] Project, Event, Core, Framework-API 增加 Event 模块;

[Add] EventExecutor, EventObject, EventHandler 添加基本的事件类;
[Add] AbstractEventObject 添加完成了 EventObject 所需方法的抽象类;
[Add] EventHandlerRegistry 添加事件处理注册器接口, 分离与事件处理注册的部分;
[Add] Core/pom.xml, Event/pom.xml, Framework-API/pom.xml, Project/pom.xml 添加 Event 模块并在所需模块中引入;
[Add] Cancelable, SupportedCancel 添加与事件取消有关的接口;
[Add] EventUtils 添加与事件处理有关的工具类;
[Add] EventUtilsTest, TestEvent, StandardHandler, IllegalHandler 添加针对 EventUtils 的完整单元测试;

ContentGrabbingJi-Event/pom.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright (C) 2020  LamGC
+  ~
+  ~ ContentGrabbingJi is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU Affero General Public License as
+  ~ published by the Free Software Foundation, either version 3 of the
+  ~ License, or (at your option) any later version.
+  ~
+  ~ ContentGrabbingJi is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU Affero General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU Affero General Public License
+  ~ along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>ContentGrabbingJi</artifactId>
+        <groupId>net.lamgc</groupId>
+        <version>3.0.0-alpha-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>ContentGrabbingJi-Event</artifactId>
+
+
+</project>