Clean up Tool garbage leftovers

these were intended to be removed long ago, but other things came up and durability handling still depended on them.

src/pocketmine/item/Axe.php

@@ -29,10 +29,6 @@ use pocketmine\entity\Entity;
 
 class Axe extends TieredTool{
 
-	public function isAxe(){
-		return $this->tier;
-	}
-
 	public function getBlockToolType() : int{
 		return BlockToolType::TYPE_AXE;
 	}

src/pocketmine/item/Hoe.php

@@ -27,10 +27,6 @@ use pocketmine\entity\Entity;
 
 class Hoe extends TieredTool{
 
-	public function isHoe(){
-		return $this->tier;
-	}
-
 	public function onAttackEntity(Entity $victim) : bool{
 		return $this->applyDamage(1);
 	}

src/pocketmine/item/Item.php

@@ -738,30 +738,6 @@ class Item implements ItemIds, \JsonSerializable{
 		return 0;
 	}
 
-	public function isPickaxe(){
-		return false;
-	}
-
-	public function isAxe(){
-		return false;
-	}
-
-	public function isSword(){
-		return false;
-	}
-
-	public function isShovel(){
-		return false;
-	}
-
-	public function isHoe(){
-		return false;
-	}
-
-	public function isShears(){
-		return false;
-	}
-
 	public function getMiningEfficiency(Block $block) : float{
 		return 1;
 	}

src/pocketmine/item/Pickaxe.php

@@ -29,10 +29,6 @@ use pocketmine\entity\Entity;
 
 class Pickaxe extends TieredTool{
 
-	public function isPickaxe(){
-		return $this->tier;
-	}
-
 	public function getBlockToolType() : int{
 		return BlockToolType::TYPE_PICKAXE;
 	}

src/pocketmine/item/Shears.php

@@ -35,10 +35,6 @@ class Shears extends Tool{
 		return 239;
 	}
 
-	public function isShears(){
-		return true;
-	}
-
 	public function getBlockToolType() : int{
 		return BlockToolType::TYPE_SHEARS;
 	}

src/pocketmine/item/Shovel.php

@@ -29,10 +29,6 @@ use pocketmine\entity\Entity;
 
 class Shovel extends TieredTool{
 
-	public function isShovel(){
-		return $this->tier;
-	}
-
 	public function getBlockToolType() : int{
 		return BlockToolType::TYPE_SHOVEL;
 	}

src/pocketmine/item/Sword.php

@@ -29,10 +29,6 @@ use pocketmine\entity\Entity;
 
 class Sword extends TieredTool{
 
-	public function isSword(){
-		return $this->tier;
-	}
-
 	public function getBlockToolType() : int{
 		return BlockToolType::TYPE_SWORD;
 	}