* 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
Semi-automatic update. These checks were performed:
- built on NixOS
- found 3.4.5 with grep in /nix/store/z24cwnyn0qhdxr11d6bh5cjakagdj3n3-libexttextcat-3.4.5
- found 3.4.5 in filename of file in /nix/store/z24cwnyn0qhdxr11d6bh5cjakagdj3n3-libexttextcat-3.4.5
