Add support for external tasks

The new 'subtasks-external' keyword adds all the subtasks from another
file referenced by a new 'external' section. The 'external' section
supports the 'user' and 'file' keywords to reference a file under the
task directory on a user's ref in the All-Users repo.

Change-Id: Id53265e596057f8495eb1c233b2679a06ca506d4
5 files changed
tree: ceea68515982d08a71df3db6caef09ab002a3645
  1. src/
  2. test/
  3. .gitignore
  4. pom.xml