Remove wrapping div with inline styles for hidden form fields.

We are dropping HTML 4.01 and XHTML strict compliance since input
tags directly inside a form are valid HTML5, and the absense of
inline styles help in validating for Content Security Policy.
Provide interface for accessing underlying IO object

In some cases users may need to work with/manipulate more of the
Tempfile api than provided by Upload. Allow users to get at the
underlying io via the common to_io method of IO/IO-like objects
Bring SQLite3Adpter init API closer to others
Merge pull request #14788 from arthurnn/conn_adpt_api

Bring SQLite3Adpter init API closer to others
Merge pull request #14755 from timlinquist/to_io_http_upload

Use common to_io so users can access the underlying IO object
Implement to_io as an alias
Change the method description
Add CHANGELOG entry for #14755 [ci skip]
Merge pull request #14738 from tilsammans/pull/11407

Remove wrapping div with inline styles for hidden form fields.

Conflicts:
	actionview/CHANGELOG.md
Update Request forgery tests to remove input wrappign div

This was changed at cbb917455f306cf5818644b162f22be09f77d4b2
Remove wrapper div for inputs in button_to

Related with cbb917455f306cf5818644b162f22be09f77d4b2