Work on functionality on crop

[webinmd]

• path in migx
• set real file extension for image after crop in /processors/file/crop.class.php
• add field for js options
• set docs for functionality

[webinmd]

Plugin example for event OnMixedImageCrop
Add watermark after crop

<?php 
switch($modx->event->name) { 
        
    case 'OnMixedImageCrop':
        
        if(!$image) return;
        
        $watermark = $modx->runSnippet('phpthumbon', [
            'input' => $image,
            'options' => 'fltr=wmi|/assets/template/images/watermark.png|C|100',
        ]);
        
        rename(MODX_BASE_PATH.$watermark,$image); 
        
        break;
}

return;