Determine trace dependencies via a task, rather than depending on

the ordering of libraryDependencies.


So, what we do here is instead add to `allDependencies`, which is resolved/used *after* `libraryDependencies` is complete.  If wanted to be more explicit, we could make a new task for "traceDependencies".

Note: This fixes the activator ordering of setting issues.  We'd like to make sure this makes it into our 1.0 release.  Once you've accepted this patch (or created an alternative solution), ping me so we can bump sbt-remote-control :)


Thanks @pvlugter  !