Switch to using common JPEG code in RISC_OSLib.
Allows better sharing when !Draw is also in ROM. Fix long (long) standing bug of not being able to drag JPEGs into !Paint using the RAM transfer protocol - some dubious pointer arithmetic meant the wrong address of JPEG data was used and so gave an error. The 3 paths that result in a JPEG->Sprite conversion now share code too. Remove local definition of FileType_JPEG, use that in the exports. Version 2.05. Tagged as 'Paint-2_05'
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