* treewide: http -> https sources
This updates the source urls of all top-level packages from http to
https where possible.
* buildtorrent: fix url and tab -> spaces
As of right now, rogue.rogueforge.net has been down for at least several hours
(likely more).
We add two mirrors here which are likely to be more reliable. We keep the
original download location as a fallback, in case that estimate turns out to be
incorrect.
