- make all constructing methods end in = for lowest precedence
- rename Scope constructing method 'apply' to 'in' to allow 'apply' to
be used on single settings as well as tuples and 'in' reads better
no privileged project member of State
no separation of Command and Apply, so no pre-filtering on State
use entries in State attributes map instead of mixing in traits to project object:
HistoryPath, Logger, Analysis, Navigate, Watch, TaskedKey
rework Navigation to be standalone instead of mixin