make frame fromBinary public, improve docs

src/Frame/SettingsFrame.php

@@ -43,9 +43,12 @@ class SettingsFrame extends Frame
         return $packed;
     }
 
-    protected function fromBinary(string $data): void
+    public function fromBinary(string $data): void
     {
-
+        for ($n = 0; $n < strlen($data) - 3; $n = $n + 3) {
+            $unpacked = unpack('vsetting/Vvalue', substr($data,$n,3));
+            $this->set($unpacked['setting'], $unpacked['value']);
+        }
     }
 }