To comply with the docs RE namespace usage:
https://github.com/yiisoft/yii2/blob/master/docs/guide/extend-creating-extensions.md

Adding a new additional validation rule in the gii-crud generator enforcing the expected format.

removed unused code $patterns

useTablePefix => useTablePrefix

use tableprefix on gii model generator

typo fix

Fixes #1263: Fixed the issue that Gii and Debug modules might be affected by incompatible asset manager configuration

without this the form does not allow choosing a different connection id

if component id is different from 'db'