* Allow a widget to be specified for the textfield count, and allow no count at all
* Test all possible states for counter and counterText
* Docs for counter
* counter is a function that generates a widget
* Tests use counter as function
* Fix analyze error in docs
* InputDecoration has counter widget, TextField has buildCounter function
* InputDecorator tests expect counter to be widget again and include
buildCounter
* counter widget example that might actually fit
* Clarify accessiblity concerns in docs
* Include isFocused param for accessibility
* Fix analyze error
* Improve docs per code review
* Rearrange getEffectiveDecoration a bit for clarity
* Fix analyze error about hashValues params
* Clean up docs and redundant code per code review
* Code review doc improvement
* Automatically wrap buildCounter widget in a Semantics widget for accessibility
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