Multiline operator placement, jsx-a11y/label adjusments

• Require linebreaks be placed before operators. Change operator-linebreak from after to before to keep terms in multi-line expressions on the same line.
• Turn off label-has-for, it’s been deprecated.
• Turn off label-has-associated-control, because it is a nightmare to have to keep a list for styled-component names that output label or input/select/textarea.