* Allow tasks to provide State transformations that are applied after all tasks complete.
* Provide convenience methods for preserving state across invocations.
* Option of session or persisted state.
This reverts commit 5793a3c66cd47087562072b69fb21d262cbbd0bc in favor of migrating project/plugins/
to project/, which makes project/ a proper project.
Conflicts:
main/Load.scala