Add a filter for nonce and state cookie names

[joshcanhelp]

• Change the protected get_storage_cookie_name() to public + static
• Add a auth0_state_cookie_name and auth0_none_cookie_name filter to the two affected methods
• Change direct calling of the cookie name constants to the static method

Sample usage:

/**
 * Prefix state and nonce cookie names. 
 * 
 * @param string $cookie_name - Cookie name to modify.
 * 
 * @return string
 */
function auth0_theme_hook_prefix_cookie_name( $cookie_name ) {
	return 'STYXKEY_' . $cookie_name;
}
 add_filter( 'auth0_state_cookie_name', 'auth0_theme_hook_prefix_cookie_name' );
 add_filter( 'auth0_nonce_cookie_name', 'auth0_theme_hook_prefix_cookie_name' );

Passes all functional tests.

Closes #494

[lbalmaceda]

what if instead of having setters for each cookie name you add a method that affects ALL the cookies' names and allows the user to set the name prefix? You'd use it like this: self::get_cookie_prefix() + static::NONCE_COOKIE_NAME

This way 1 change fixes all future errors. Unless of course, you consider the state and nonce the only ones that could fall into this issue.

[lbalmaceda]

what about self::get_cookie_prefix() + static::NONCE_COOKIE_NAME? Same for the remaining calls

[joshcanhelp]

No need to exert that kind of control, name is irrelevant.

[joshcanhelp]

@lbalmaceda - I'd rather the developer have full control over the name.

[joshcanhelp]

@lbalmaceda - Added a sample usage to prefix all cookie names.

[lbalmaceda]

Ah it's easier than I thought. OK!

[lbalmaceda]

🍇

[galengidman]

Thank you, thank you, thank you.