deferred validation

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

Added support of deferred validation.
Removed mentions of $deriveKeyStrategy from Security phpdoc
`yii\authclient\widgets\AuthChoice` now preserves initial settings while opening popup
Update yii.activeForm.js

remove empty message arrays
Update yii.activeForm.js
Fixes #4489: RBAC PhpManager wasn't saving multiple assignmentsFixes #4489: RBAC PhpManager wasn't saving multiple assignments properly
[skip ci] Fixes #4461
Fixed link
added unit test for #4489
code style + test groups
more explicit comment in phpdoc, code style
Removed unnecessary code
Fixes #4489: Fixed MySQL RBAC manager
Update input-validation.md
fixed typo and some links
Merge pull request #4510 from xBazilio/patch-3

fixed typo and some links
Grammar fix
add start-installation.md
up errors translate