Add missing implicit size checks of tags by passing the already checked
explicitly given size forward.
Also adds my fuzzing test for the ICC parser as it is security critical,
by being used by multiple image formats.
Change-Id: Ieb632ccb78f9b445a276959ffbd66fa04a7a5b45
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
