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feature: TJLedGroup lifecycle events (kStart/kDone/kRepeatStart/kElementChanged) (#174)

* feature: TJLedGroup lifecycle events (kStart/kDone/kRepeatStart/kElementChanged)

Add GroupUpdateResult, returned by TJLedGroup::Update()/Update(t) instead of
the old plain bool, reporting group-level lifecycle events for both JLedGroup and
JLedRefGroup: IsStarted()/IsDone()/IsRepeatStarted()/IsElementChanged(), with
matching OnStart()/OnDone()/OnRepeatStart()/OnElementChanged() callbacks.

kStart/kDone fire once per run; kDone is latched (not diffed) since Stop()
mutates is_running_ outside of Update(). kRepeatStart fires once per
repetition, including the first, mode-independently, and composes correctly
under nesting. kElementChanged fires for Sequential groups when the active
element changes, mid-run or on wraparound to a new repetition; it never
fires in Parallel mode, for a single-element sequence, and it does not see
into nested subgroups (a nested group's own element transitions are opaque
to its parent).

Per-element event forwarding from individual TJLed instances through
TJLedRefGroup (with element identity) is deferred to a separate PR.

* new examples for JLedGroup lifecycle events in group_sequence example
and restructuring of the group examples

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