Plan/Engine: Added function in Task.cpp to parse PlanControl's inline arg.
Plan/Engine: Reinstating support for PlanControl::PC_LOAD.
Plan/Engine: In Statistics, ignoring stopped plan or maneuver if timers have not been started.
Plan/Engine: Clearing Plan object after parsing if we're simply loading the plan and not executing it afterwards.
Plan/Engine: Clearing Plan object if parse fails.
Merge branch 'feature/load_plan'