Read planner preferences when we use them

Read and use the last_stop preference in the plan function.
Read the plan notes preferences and set variables (plan_verbatim,
plan_display_runtime, plan_display_duration, and plan_display_transitions)
in the add_plan_to_notes function. Don't read the preferences and set
variables otherwise. Both plan and add_plan_to_notes functions are called
on data change.

Previous behaviour was:
- Set variables on declaration
- Reset variables in plan function (even variables that only relate to
  planner notes output)
- Changing a preference triggered set_xxx function which sets variable,
  then plan function, which sets variable again.

Apart from being inefficient, the previous behaviour made it difficult to
track down where and when variables were set.

Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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