Remove arrow entities when the player leaves to prevent killing on startup

Reviewed-on: MineClone2/MineClone2#1947

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+# mcl_armor
+
+This mod implement the ability of creating armors.

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+
+This mod implement the ability of creating armors.
+
+Armors are basically items that a player can equip on four different slots on him (head, feet, torso and feet) to get advantages.

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+
+Armors are basically items that a player can equip on four different slots on him (head, feet, torso and feet) to get advantages.
+
+These armors have also a texture which is visible to other players, inside inventory or in 3rd person view.

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+
+These armors have also a texture which is visible to other players, inside inventory or in 3rd person view.
+
+## Creating an Armor Set

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+
+## Creating an Armor Set
+
+The `mcl_armor.register_set()` function aims to simplificate the process of creating a full set of armor.

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+
+The `mcl_armor.register_set()` function aims to simplificate the process of creating a full set of armor.
+
+This function register a four piece of armor (head, torso, leggings, feets) using a definition table:

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+	name = "dummy_armor",
+
+	--description of the armor material
+	--do NOT localize this string, it will be concatenated will each piece of armor's description and result will be automatically fetched from your mod's translation files

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+		end,
+	},
+
+	--WARNING: 2d preview will be deprecated soon