Bug in Image Editor with Centralized Core
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https://github.com/concrete5/concrete5-5.7.0/blob/develop/web/concrete/tools/files/edit.php#L20
DIR_BASE should be DIR_BASE_CORE:
$view->setInnerContentFile(DIR_BASE_CORE . '/views/image-editor/editor.php');
DIR_BASE should be DIR_BASE_CORE:
$view->setInnerContentFile(DIR_BASE_CORE . '/views/image-editor/editor.php');