WebP mime type and Image_lib support

Author: NielBuys

application/config/mimes.php

@@ -86,6 +86,7 @@
 	'mj2'	=>	array('image/jp2', 'video/mj2', 'image/jpx', 'image/jpm'),
 	'mjp2'	=>	array('image/jp2', 'video/mj2', 'image/jpx', 'image/jpm'),
 	'png'	=>	array('image/png', 'image/x-png'),
+	'webp'  => 'image/webp',
 	'tiff'	=>	'image/tiff',
 	'tif'	=>	'image/tiff',
 	'heic' 	=>	'image/heic',

system/libraries/Image_lib.php

@@ -573,7 +573,7 @@ public function initialize($props = array())
 		else
 		{
 			// Is there a file name?
-			if ( ! preg_match('#\.(jpg|jpeg|gif|png)$#i', $this->new_image))
+			if ( ! preg_match('#\.(jpg|jpeg|gif|png|webp)$#i', $this->new_image))
 			{
 				$this->dest_image  = $this->source_image;
 				$this->dest_folder = $this->new_image;