[Style] Addition of the support of background-image-repeat #40
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Linked to the issue #39
The paintTileRepeat function could be shorter but I wanted to avoid having a test for each image to check if it's in the last column/line, in case there are a lot of images to draw. Thus, it's longer but it's supposed to be slightly more optimized (it's probably not noticeable in the extreme majority of use cases, though).