Use default flash element.
Throw exception if flash key value is not an array.

Return null if flash key doesn't exist in session.
Improve getting namespaced class name.
Merge pull request #3971 from ADmad/3.0-flash

Use default flash element.
Fix error where checkboxes could not be unchecked.

Sending checked=false should be honoured.

Fixes #3995
Add missing h()

We should set a good example :)
Merge pull request #3996 from ADmad/3.0-viewvarstrait

Improve getting namespaced class name.
Added accessor method getView() to ViewVarsTrait.