Level: Change isInWorld signature to use ints instead of floats

this is only used in one place, where it's being given floats, and it's 10% faster to use int for this because it won't convert it.

It is also 25% faster to remove typehints and 60% faster to inline it. We really need a proper PHP preprocessor for inlining.

src/pocketmine/level/ChunkManager.php

@@ -142,11 +142,11 @@ interface ChunkManager{
 	 * Returns whether the specified coordinates are within the valid world boundaries, taking world format limitations
 	 * into account.
 	 *
-	 * @param float $x
+	 * @param int $x
-	 * @param float $y
+	 * @param int $y
-	 * @param float $z
+	 * @param int $z
 	 *
 	 * @return bool
 	 */
-	public function isInWorld(float $x, float $y, float $z) : bool;
+	public function isInWorld(int $x, int $y, int $z) : bool;
 }

src/pocketmine/level/Level.php

@@ -1318,7 +1318,7 @@ class Level implements ChunkManager, Metadatable{
 		return $this->getChunk($x >> 4, $z >> 4, false)->getFullBlock($x & 0x0f, $y, $z & 0x0f);
 	}
 
-	public function isInWorld(float $x, float $y, float $z) : bool{
+	public function isInWorld(int $x, int $y, int $z) : bool{
 		return (
 			$x <= INT32_MAX and $x >= INT32_MIN and
 			$y < $this->worldHeight and $y >= 0 and

src/pocketmine/level/SimpleChunkManager.php

@@ -172,7 +172,7 @@ class SimpleChunkManager implements ChunkManager{
 		return $this->worldHeight;
 	}
 
-	public function isInWorld(float $x, float $y, float $z) : bool{
+	public function isInWorld(int $x, int $y, int $z) : bool{
 		return (
 			$x <= INT32_MAX and $x >= INT32_MIN and
 			$y < $this->worldHeight and $y >= 0 and