Fix memory leak, add command. Merge from master

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>us.myles</groupId>
     <artifactId>viaversion</artifactId>
-    <version>0.6.6-SNAPSHOT</version>
+    <version>0.6.7-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>ViaVersion</name>

src/main/java/us/myles/ViaVersion/commands/ViaVersionCommand.java

@@ -1,5 +1,6 @@
 package us.myles.ViaVersion.commands;
 
+import io.netty.util.ResourceLeakDetector;
 import lombok.RequiredArgsConstructor;
 import org.bukkit.Bukkit;
 import org.bukkit.command.Command;
@@ -39,6 +40,13 @@ public class ViaVersionCommand implements CommandExecutor {
                 } else if (args[0].equalsIgnoreCase("debug")) {
                     plugin.setDebug(!plugin.isDebug());
                     sender.sendMessage(color("&6Debug mode is now " + (plugin.isDebug() ? "&aenabled" : "&cdisabled")));
+                } else if (args[0].equalsIgnoreCase("displayleaks")) {
+                    if (ResourceLeakDetector.getLevel() != ResourceLeakDetector.Level.ADVANCED) {
+                        ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.ADVANCED);
+                    } else {
+                        ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.DISABLED);
+                    }
+                    sender.sendMessage(color("&6Leak detector is now " + (ResourceLeakDetector.getLevel() == ResourceLeakDetector.Level.ADVANCED ? "&aenabled" : "&cdisabled")));
                 } else if (args[0].equalsIgnoreCase("dontbugme")) {
                     boolean newValue = !plugin.getConfig().getBoolean("checkforupdates", true);
                     plugin.getConfig().set("checkforupdates", newValue);

src/main/java/us/myles/ViaVersion/handlers/ViaDecodeHandler.java

@@ -53,6 +53,8 @@ public class ViaDecodeHandler extends ByteToMessageDecoder {
                 if (e.getCause() instanceof Exception) {
                     throw (Exception) e.getCause();
                 }
+            } finally {
+                bytebuf.release();
             }
         }
     }