Rename SpiderScripts to dCacheScripts

[onnozweers]

Because Ada is not only for Spider users.

When renaming a repo on Github, all history should be kept, and Github should create forwarding links from the old name to the new name, so that nothing breaks.

[hailihu]

To be decided if we should move get-macaroon and view-token here. This will affect how we rename this repo. To be further discussed.