add Tent object and implement sleep functionality with lighting adjustments

src/de/miaurizius/jgame2d/entity/item/TentObj.java

@@ -0,0 +1,30 @@
+package de.miaurizius.jgame2d.entity.item;
+
+import de.miaurizius.jgame2d.core.GamePanel;
+import de.miaurizius.jgame2d.core.enums.EntityType;
+import de.miaurizius.jgame2d.core.enums.GameState;
+import de.miaurizius.jgame2d.entity.Entity;
+
+public class TentObj extends Entity {
+
+    public TentObj(GamePanel panel) {
+        super(panel);
+
+        type = EntityType.ITEM;
+        consumable = true;
+        name = "Tent";
+        down1 = initEntitySprites("objects/tent");
+        description = "[" + name + "]\nA small tent to rest\nuntil next morning.";
+        price = 200;
+        stackable = true;
+    }
+
+    @Override
+    public boolean use(Entity entity) {
+        panel.gameState = GameState.SLEEP;
+        panel.playSE(14);
+        panel.player.life = panel.player.maxLife;
+        panel.player.mana = panel.player.maxMana;
+        return true;
+    }
+}