add enzyme/axiom interfaces

use axiom/RepositoryInterface in tests and store music
add axiom/Models/ModelInterface to TuneCollection

src/Models/Memory/BaseIterator.php

@@ -1,7 +1,8 @@
 <?php
 namespace XaiCorp\AbcParser\Models\Memory;
 
-abstract class BaseIterator extends BaseObject implements \Iterator, \Countable, \ArrayAccess {
+abstract class BaseIterator extends BaseObject implements \Iterator, \Countable, \ArrayAccess
+{
 
     private $position = 0;
     protected $collection = array();

src/Models/Memory/TuneCollection.php

@@ -19,19 +19,19 @@ class TuneCollection extends BaseIterator implements ModelInterface
     // private $tunes = array();
 
     //abc tunebook header fields
-    private $A = array();     //Author / Area
-    private $B = array();     //Book
-    private $C = array();     //Composer
-    private $D = array();     //Discography
-    private $F = array();        //file url
-    private $H = array();     //History
+    private $A = [];     //Author / Area
+    private $B = [];     //Book
+    private $C = [];     //Composer
+    private $D = [];     //Discography
+    private $F = [];        //file url
+    private $H = [];     //History
     private $L;     //note length
     private $M;     //Meter
-    private $N = array();     //Notes
-    private $O = array();     //Origin
+    private $N = [];     //Notes
+    private $O = [];     //Origin
     private $R;     //Rhythm
-    private $S = array();     //Source
-    private $Z = array();     //Transcription
+    private $S = [];     //Source
+    private $Z = [];     //Transcription
 
 
     // public function __construct()