Presently the timeline directive is a single gigantic directive
containing all of the timeline code. Given the amount of code
involved, this complicates maintenance and makes it excessively
difficult to improve.
This refactors the single timeline directive into four separate
collaborating directives: a controller, an overview, a viewport,
and dstat charts. Each child directive is functionally separate
from the others, but can communicate with other chart components
via the controller. This separation should greatly improve future
maintenance, and has already led to several (included) bug fixes.
Change-Id: Id11d15a34466e42c5ebc9808717d52b468245e3a
e7473f7f01