renamed setAttribute to setAttributeObject and addSubTag to addSubTag…

…Object in order to clarify that the argument should be an object not a string. And it differentiates these methods and their signatures from the similarly named methods in the Htmlfactory library which take strings as arguments and makes the objects on the fly.

src/html/tag/TagInterface.php

@@ -29,10 +29,10 @@ public function setAllowedSubtags(array $subTagNames): void;
     public function getAllowedSubTags(): array;
 
     /**
-     * addSubTag
+     * addSubTagObject
      * @param TagVoidInterface $tag
      */
-    public function addSubTag(TagVoidInterface $tag): void;
+    public function addSubTagObject(TagVoidInterface $tag): void;
 
     /**
      * setInnerTextAllowed

src/html/tag/TagVoidInterface.php

@@ -41,11 +41,11 @@ public function setAllowedAttributes(array $allowedAttributes): void;
     public function getAllowedAttributes(): array;
 
     /**
-     * setAttribute
+     * setAttributeObject
      * @param AttributeVoidInterface $attribute
      * @return TagVoidInterface
      */
-    public function setAttribute(AttributeVoidInterface $attribute): TagVoidInterface;
+    public function setAttributeObject(AttributeVoidInterface $attribute): TagVoidInterface;
 
     /**
      * getAttribute