DartUnit configuration test method/group validation (WEB-1560).
Test for Dart create function quick fix (WEB-14410).
DartUnit test model caching to speed up validation.
Merge branch 'dartunit_config_validation' of https://github.com/pq/intellij-plugins
Folow-up for WEB-1560 Dart, DartUnit Run configuration: provide validation for entered method/group name
Merge branch 'named_arg_presentation_fix' of https://github.com/pq/intellij-plugins