Added support for varying log levels configurable in the server config (see log_level in default.conf)

Error logs now properly print to stderr when possible
Colour-coded logs
Addressed a scenario in which outgoing packet writes could get hung up
Fixed interface incorrect definition message on server startup

Server/src/main/core/game/activity/ActivityManager.java

@@ -1,12 +1,15 @@
 package core.game.activity;
 
 import core.game.node.entity.player.Player;
+import core.tools.Log;
 import core.tools.SystemLogger;
 import core.game.world.GameWorld;
 
 import java.util.HashMap;
 import java.util.Map;
 
+import static core.api.ContentAPIKt.log;
+
 /**
  * Manages the activities.
  * @author Emperor
@@ -50,7 +53,7 @@ public final class ActivityManager {
 		ActivityPlugin plugin = ACTIVITIES.get(name);
 		if (plugin == null) {
 			if (GameWorld.getSettings().isDevMode()) {
-				SystemLogger.logErr(ActivityManager.class, "Unhandled activity - " + name + "!");
+				log(ActivityManager.class, Log.ERR, "Unhandled activity - " + name + "!");
 			}
 			return false;
 		}

Server/src/main/core/game/activity/Cutscene.kt

@@ -25,6 +25,7 @@ import core.api.Event
 import core.api.utils.PlayerCamera
 import core.tools.SystemLogger
 import core.game.world.GameWorld
+import core.tools.Log
 
 /**
  * A utility class for making cutscenes.
@@ -259,7 +260,7 @@ abstract class Cutscene(val player: Player) {
                         try {
                             endActions?.invoke()
                         } catch (e: Exception) {
-                            SystemLogger.logErr(this::class.java, "There's some bad nasty code in ${this::class.java.simpleName} end actions!")
+                            log(this::class.java, Log.ERR,  "There's some bad nasty code in ${this::class.java.simpleName} end actions!")
                             e.printStackTrace()
                         }
                         return true
@@ -347,7 +348,7 @@ abstract class Cutscene(val player: Player) {
     fun logCutscene(message: String)
     {
         if(ServerConstants.LOG_CUTSCENE)
-            SystemLogger.logInfo(this::class.java, "$message")
+            log(this::class.java, Log.FINE,  "$message")
     }
 
     fun clearNPCs() {