Removed the duplicated ColoredString class

We had two classes serving the same purpose in different packages.

Closed #400

Author: Bernardo Sulzbach

src/main/java/org/mafagafogigante/dungeon/entity/creatures/ColoredString.java

@@ -2,6 +2,7 @@
 
 import org.mafagafogigante.dungeon.entity.Luminosity;
 import org.mafagafogigante.dungeon.entity.items.Item;
+import org.mafagafogigante.dungeon.game.ColoredString;
 import org.mafagafogigante.dungeon.game.Direction;
 import org.mafagafogigante.dungeon.game.DungeonString;
 import org.mafagafogigante.dungeon.game.Game;