Refactoring of the download code.

This should be the main step in the download refactoring initiated by commit
81a2a06818d367f8528c74311171417beb9e1592.
The stub functions introduced by that commit were implemented.

The big download code was mostly composed of two steps, and so it has been
naturally splitted in two functions :  download_external and download_internal

file:/// urls are now handled manually, instead of forcing the use of the
internal downloader.

Thanks to Dan for fixing the remaining issues and cleaning up the patch :)

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>

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