Fixes #3358: Removed automatic CSRF meta tag generation by `View`. Added `Html::csrfMetaTags()` and its call to main layout files
Application templates refactoring
Fixes #3979: Alert widget in advanced app is now able to display multiple flash messages of the same type
Fixes #3793: Changed inline autocomplete hints style to get more IDEs support
Merge commit 'baccc9b600d37d1e790007942535d1ef449f7054' into 4.0