Fixes #3581: Added `yii\validators\CompareValidator::type` to support type conversion before comparing values

Fixes #3511: Dropped `yii.allowAction()` and modified `yii.confirm()` in `yii.js` to support callbacks

Updated yii.activeform.js to use the encode option introduced in #4122.
Updated ActiveForm with new option encodeErrorSummary

fixes #4690, close #4691

- `beforeValidateAll`
- `afterValidateAll`

fixes #4234, close #4559

Refactored

remove empty message arrays

Added support of deferred to ```ActiveForm``` validation.

close #4436

Fixes #3934: yii.handleAction() in yii.js does not handle the case when a hyperlink is a hash character

Upgrade to 3.0.40