Re-add Harvester support to Planner UI
Re-add Harvester support to Planner UI

This code, and harvester semantics, have changed since 57977b30; this
commit makes the minimal changes required to the re-added code to get
this to compile. The coming commits will update the logic.

PiezPiedPy/Kerbalism,PiezPiedPy/Kerbalism,PiezPiedPy/Kerbalism