Add missing directives in CSP

[MadCat34]

Provide a narrative description of what you are trying to accomplish:

Some directives are missing in Fetch directive

• child-src
• manifest-src
• worker-src
• prefetch-src
• script-src-elem
• script-src-attr
• style-src-elem
• style-src-attr

And some Navigation, Document and Reporting directives are missing.

• base-uri
• plugin-types
• form-action
• frame-ancestors
• navigate-to
• report-to

Code to reproduce the issue

$csp = new ContentSecurityPolicy();
$csp->setDirective('worker-src', ['https://*.google.com', 'http://foo.com']);
$csp->toString();

Actual result

Throw a Exception\InvalidArgumentException

New result

toString() should return "Content-Security-Policy: worker-src https://*.google.com http://foo.com;"

This PR fixes #163

[michalbundyra]

Thanks, @MadCat34!

[MadCat34]

Thanks, @michalbundyra