Added an assembly to pom for packaging test classes and resources so
that add-on projects can depend them.
Change AugmentedScriptActor, ActorScriptBuilder, and subclasses to
indicate nullable and mutable inputs so that FSharp actor will work
correctly.
Added method for reading a text file from classpath.
include all main and test resources on Eclipse class path
Access test workflows and expected files on classpath so that test
classes will work from tests in add-on projects.