Merge pull request #3585 from pawzar/dev

Adding rotateByCopy to yii\log\FileTarget #3562
added test case to acually create cols with virtual type

verify issue #3473
Docs about cross-DBMS relations added
Example code consistency fix
Incorrect path to AppAssets at docs fixed
Merge pull request #3588 from klimov-paul/3429-docs-app-asset-location

Fix #3429: Incorrect path to AppAssets at docs
Fix 'db-active-record.md'
Merge pull request #3586 from klimov-paul/2020-doc-cross-dbms-relations

Fix for #2020: docs about cross-DBMS relations
Fix incomplete obsolete filling in i18n db extractor

Obsolete keys searching isn't work when we have serveral categories for tranlation with DbMessageSource. Obsolete array filled with last message category only, because it'll always overwritten.
fixed cubrid test case
Update CHANGELOG.md
Update CHANGELOG.md
Merge pull request #3591 from advsm/patch-1

Incomplete obsolete filling in i18n db extractor
Update Response.php

typo
first approach to a PDF guide
generate PDF file chapters from README.md structure
Improve array support for "data" attribute in renderTagAttributes()
Add #3597 to CHANGELOG.md
Merge pull request #3597 from armab/patch-1

Improved array support for "data" attribute in renderTagAttributes()
Fixes #3564