tag/TagBuilder: rename Commit() to CommitNew()

src/tag/Tag.cxx

@@ -94,7 +94,7 @@ Tag::Merge(const Tag &base, const Tag &add)
 {
 	TagBuilder builder(add);
 	builder.Complement(base);
-	return builder.Commit();
+	return builder.CommitNew();
 }
 
 Tag *

src/tag/TagBuilder.cxx

@@ -134,7 +134,7 @@ TagBuilder::Commit(Tag &tag)
 }
 
 Tag *
-TagBuilder::Commit()
+TagBuilder::CommitNew()
 {
 	Tag *tag = new Tag();
 	Commit(*tag);

src/tag/TagBuilder.hxx

@@ -101,7 +101,7 @@ public:
 	 * returned object is owned by the caller.  This object is
 	 * empty afterwards.
 	 */
-	Tag *Commit();
+	Tag *CommitNew();
 
 	void SetTime(int _time) {
 		time = _time;

src/tag/TagId3.cxx

@@ -370,7 +370,7 @@ tag_id3_import(struct id3_tag *tag)
 	scan_id3_tag(tag, &add_tag_handler, &tag_builder);
 	return tag_builder.IsEmpty()
 		? nullptr
-		: tag_builder.Commit();
+		: tag_builder.CommitNew();
 }
 
 static size_t