Function cacheImage

Creates the cache folder version of the image, including watermarking

Package: core\functions\functions-image
Located at functions-image.php

Parameters summary
`string`	`$newfilename`	the name of the file when it is in the cache
`string`	`$imgfile`	the image name
`array`	`$args`	the cropping arguments
`boolean`	`$allow_watermark`	set to true if image may be watermarked
`string`	`$theme`	the current theme
`string`	`$album`	the album containing the image