tracker-extract: push all albumart code to tracker-miner-fs
Now we signal data that is used to be processed for albumart. This is all handled in the miner-fs now, so the extractors simply say, here is my data and length of data (and some other details like artist), now process it. The miner-fs then uses the code previously tracker-extract-albumart.c to either download the art, use GdkPixbuf or save the data directly to the right filename. The thumbnails are then requested staight after.
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