- Reason: browser compatibility.

	- Even if it's a dead PHP version.

Fix Preview object in the controller, replace fetchObject() with fetch() in load, and specify all args.

	- Using fetchObject() resulted in an exception, fetch() works fine.

	- Remove unused use statements
	- Declare @throws tags.

	- Save and load functions now return Preview objects, or arrays of Preview objects
	- Save now accepts a single $values parameter instead of separate values
	- Move some code from PreviewLinksForm constructor to a separate function and use that in the buidlForm instead.