(REF) TokenProcessor - Allowing adding rows by array

(REF) TokenProcessor - Allowing adding rows by array

Before
-------------------

When composing a message, you need to add a row and then use the fluent
`TokenRow` stub, eg:

```php
$p->addRow()->context(['contact_id' => 123]);
$p->addRow()->context(['contact_id' => 456]);
```

After
-------------------

When composing a message, you don't have to use the fluent `TokenRow` stub.
Just give an array:

```php
$p->addRow(['contact_id' => 123]);
$p->addRow(['contact_id' => 456]);
```

Or:

```php
$p->addRows([
  ['contact_id' => 123],
  ['contact_id' => 456],
]);
```

You still have the option of using the fluent interface.