Only send block sounds when a block is being placed

Previously, any time a block was clicked whether it be with a block in the hand or not, a sound would play. This checks if the item in the players hand is indeed a block as well as the same block in the UpdateBlockPacket, and properly plays the packet.

connector/pom.xml

@@ -90,6 +90,12 @@
             <version>8.3.1</version>
             <scope>compile</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>29.0-jre</version>
+            <scope>compile</scope>
+        </dependency>
         <dependency>
             <groupId>com.github.steveice10</groupId>
             <artifactId>opennbt</artifactId>