Minor firmware blit flashing improvements #785
Merged
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First half: fixes some issues with failed flashes. Second half: use file size from headers instead of the actual file size.
A side effect of this is that you can append extra data to the end of a .blit and the flashing code ignores it (at least when loading from the SD card). Previously it would get flashed, but would likely get another .blit flashed on top of it later.