Description of issue:
When building Cura a lot of source is pulled from upstream repos, such as Github. We need to mirror all of that to our own servers, and change the build to pull from our repos. So when a build is done, it shouldn't hit any other outside repos.
Some URLs we need to mirror (incomplete):
We also need to mirror source that doesn't have a git repo by copying the source tarball to our servers.
The mirrors need to be set up on code.alephobjects.com and the build CMakeLists.txt needs to be updated to new URLs.