Minor tweak on Exp system + Diet's Cygnus quest line

Changed minimum level required to gain EXP of mob from -5 to -20 the mob level (players below that level sees a red-colored font when displaying higher-leveled mob HPbar). Thanks to DietStory dev team, fixed some quests for KoC.

scripts/quest/20720.js

@@ -0,0 +1,28 @@
+/*
+	QUEST: Before the Mission in Perion Begins
+	NPC: Neinheart
+*/
+
+var status = -1;
+
+function start(mode, type, selection){
+	if(mode == -1 || (mode == 0 && status == 0)){
+		qm.dispose();
+		return;
+	}
+	else if(mode == 0)
+		status--;
+	else
+		status++;
+
+
+	else if(status == 0){
+		qm.sendAcceptDecline("How's the leveling up so far? By this time, you might be able to participate in the Party Quest at #m103000000#. Leveling up is important, yes, but we need you now to take on a mission as a Cygnus Knight. We just received a new information that may help us.");
+	}
+	else if(status == 1){
+		qm.forceStartQuest();
+		qm.dispose();
+	}
+}
+
+function end(mode, type, selection){}