Heap of bugfixes, cleanup and PHP 7 upgrades

src/pocketmine/math/Matrix.php

@@ -55,17 +55,17 @@ class Matrix implements \ArrayAccess{
 		for($r = 0; $r < $this->rows; ++$r){
 			$this->matrix[$r] = [];
 			for($c = 0; $c < $this->columns; ++$c){
-				$this->matrix[$r][$c] = isset($m[$r][$c]) ? $m[$r][$c] : 0;
+				$this->matrix[$r][$c] = $m[$r][$c] ?? 0;
 			}
 		}
 	}
 
 	public function getRows(){
-		return ($this->rows);
+		return $this->rows;
 	}
 
 	public function getColumns(){
-		return ($this->columns);
+		return $this->columns;
 	}
 
 	public function setElement($row, $column, $value){

src/pocketmine/math/Vector2.php

@@ -100,7 +100,7 @@ class Vector2{
 		if($x instanceof Vector2){
 			return $this->distanceSquared($x->x, $x->y);
 		}else{
-			return pow($this->x - $x, 2) + pow($this->y - $y, 2);
+			return (($this->x - $x) ** 2) + (($this->y - $y) ** 2);
 		}
 	}
 

src/pocketmine/math/Vector3.php

@@ -189,7 +189,7 @@ class Vector3{
 	}
 
 	public function distanceSquared(Vector3 $pos){
-		return pow($this->x - $pos->x, 2) + pow($this->y - $pos->y, 2) + pow($this->z - $pos->z, 2);
+		return (($this->x - $pos->x) ** 2) + (($this->y - $pos->y) ** 2) + (($this->z - $pos->z) ** 2);
 	}
 
 	public function maxPlainDistance($x = 0, $z = 0){