Minor widget_tester refactoring and docs (#3472)

This reorders some classes so that this file makes more sense, and adds
a bunch of docs. It also makes the following changes:

* Move allElements from Instrumentation to TestWidgets. (Instrumentation
  is going away.)

* Remove findElements.

* Rename byElement to byElementPredicate

* Rename byPredicate to byWidgetPredicate

* Implement _WidgetPredicateFinder so that byWidgetPredicate has good
  messages

* Fix one use of byElementPredicate to use byWidgetPredicate.
7 files changed
tree: 68d90586ee2d6e1f8a8e1c522c4c19c4eae6a0d9
  1. bin/
  2. dev/
  3. examples/
  4. infra/
  5. packages/
  6. travis/
  7. .travis.yml
  8. AUTHORS
  9. CONTRIBUTING.md
  10. ISSUE_TEMPLATE.md
  11. LICENSE
  12. README.md
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