Add type hints to Artist class members

lib/Artist.php

@@ -5,23 +5,21 @@ use function Safe\date;
 /**
  * @property string $UrlName
  * @property array<string> $AlternateSpellings
+ * @property array<string> $_AlternateSpellings
  */
 class Artist extends PropertiesBase{
-	public $ArtistId;
-	public $Name;
-	public $DeathYear;
-	public $Created;
-	public $Updated;
-	protected $_UrlName;
-	protected $_AlternateSpellings;
+	public ?int $ArtistId;
+	public ?string $Name;
+	public ?int $DeathYear;
+	public ?datetime $Created;
+	public ?datetime $Updated;
+	protected ?string $_UrlName;
+	protected  $_AlternateSpellings;
 
 	// *******
 	// GETTERS
 	// *******
 
-	/**
-	 * @return string
-	 */
 	protected function GetUrlName(): string{
 		if($this->Name === null || $this->Name == ''){
 			return '';

lib/Artwork.php

@@ -3,11 +3,9 @@ use Safe\DateTime;
 use function Safe\copy;
 use function Safe\date;
 use function Safe\exec;
-use function Safe\filesize;
 use function Safe\getimagesize;
 use function Safe\ini_get;
 use function Safe\preg_replace;
-use function Safe\sprintf;
 
 /**
  * @property string $UrlName

lib/ArtworkTag.php

@@ -5,9 +5,6 @@ class ArtworkTag extends Tag{
 	// GETTERS
 	// *******
 
-	/**
-	 * @return string
-	 */
 	protected function GetUrl(): string{
 		if($this->_Url === null){
 			$this->_Url = '/artworks?query=' . Formatter::MakeUrlSafe($this->Name);