Implement WXA code and WXA QR code getting.

weixin4j-wxa/src/test/java/com/foxinmy/weixin4j/wxa/api/WxaCodeParameterTest.java

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+package com.foxinmy.weixin4j.wxa.api;
+
+import static org.junit.Assert.assertTrue;
+
+import java.awt.Color;
+
+import org.junit.Test;
+
+import com.alibaba.fastjson.JSON;
+
+public class WxaCodeParameterTest {
+
+	@Test
+	public void test() {
+		WxaCodeParameter param = new WxaCodeParameter("pages/index/index", 430, false, new Color(1, 2, 3), true);
+		String json = JSON.toJSONString(param);
+		assertTrue(json.contains("\"line_color\":"));
+		assertTrue(json.contains("\"is_hyaline\":true"));
+	}
+
+}

weixin4j-wxa/src/test/java/com/foxinmy/weixin4j/wxa/api/WxaCodeUnlimitParameterTest.java

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+package com.foxinmy.weixin4j.wxa.api;
+
+import static org.junit.Assert.assertTrue;
+
+import java.awt.Color;
+
+import org.junit.Test;
+
+import com.alibaba.fastjson.JSON;
+
+public class WxaCodeUnlimitParameterTest {
+
+	@Test
+	public void test() {
+		WxaCodeUnlimitParameter param = new WxaCodeUnlimitParameter("myScene", "pages/index/index", 430, false, new Color(1, 2, 3), true);
+		String json = JSON.toJSONString(param);
+		assertTrue(json.contains("\"line_color\":"));
+		assertTrue(json.contains("\"is_hyaline\":true"));
+	}
+
+}

weixin4j-wxa/src/test/java/com/foxinmy/weixin4j/wxa/api/WxaQrCodeParameterTest.java

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+package com.foxinmy.weixin4j.wxa.api;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+import com.alibaba.fastjson.JSON;
+
+public class WxaQrCodeParameterTest {
+
+	@Test
+	public void test() {
+		WxaQrCodeParameter param = new WxaQrCodeParameter("myPath", 100);
+		String json = JSON.toJSONString(param);
+		assertTrue(json.contains("\"path\":\"myPath\""));
+		assertTrue(json.contains("\"width\":100"));
+	}
+
+}