Form with Submit button

Added a form with submit button and one hidden field (test-inputfield
with value test-value).
Why do I have all kinds of files in my changelist with ~ behind their
name which I didn't conciously alter?? I don't dare not to add them but
I have no idea why they are there. And test.blade.php is also not made
by me. The only file I meant to update was cellex.blade.php.