Use crytographic random source
Add auto-resuming of DL, not well tested.
Revert "Add auto-resuming of DL, not well tested."
Asked by upstream:
--> https://github.com/PlayOnLinux/POL-POM-4/pull/6

This reverts commit 8177657627ae47a60acb7b2885183dc35c5a59f6.
Merge pull request #6 from tharvik/master

Use a more secure algorithme to generate the cookies.