API fixes for improv
add Block.to_code_lines
working on Actors v3. Need to support state. Renamed alloc_stack -> create_stack
Cleanup, dead code in stateful_code.cpp, improve get_field and unique_name
working on actor_inject_state
cleanup: remove unused Type.getField and setField
working on actors
add get_input_description, now make_actor does checks on the block
migration now works on Stacks and Actors
Fixes for improv's module loading
Add the root-stack list, used for migration