[ticket/11344] Add migration to remove acp_style_components module in 3.1

PHPBB3-11344
[ticket/11344] Fix url of license

PHPBB3-11344
[ticket/11344] Upgrade migration to namespaces

PHPBB3-11344
Merge pull request #1704 from dhruvgoel92/ticket/11344

[ticket/11344] Add migration to remove acp_style_components module in 3.1