Riizade/config file (#520)

* added POJO + yaml file

* made config members public

* switched to yaml

* modified files to use YamlConfig over ServerConstants

* removed constants from ServerConstants

* removed unused imports

* removed unused import

* removed world ini

* removed now unused .ini files

* fixed docker-launch.sh

* added jackson dependency JARs

* fixed errors

* removed unused server config values, added world defaults

* don't use env variables for docker

* fixed package imports/specifiers for js files

src/net/server/channel/handlers/DueyHandler.java

@@ -23,6 +23,7 @@ package net.server.channel.handlers;
 
 import client.MapleClient;
 import client.processor.DueyProcessor;
+import config.YamlConfig;
 import constants.ServerConstants;
 
 import net.AbstractMaplePacketHandler;
@@ -33,7 +34,7 @@ public final class DueyHandler extends AbstractMaplePacketHandler {
     
     @Override
     public final void handlePacket(SeekableLittleEndianAccessor slea, MapleClient c) {
-    	if (!ServerConstants.USE_DUEY){
+    	if (!YamlConfig.config.server.USE_DUEY){
             c.announce(MaplePacketCreator.enableActions());
             return;
     	}