Issue #2217731 by crowdcg, lauriii, davidhernandez, aczietlow, jjcarrion, mortendk, karolus, pakmanlh, LewisNyman, aboros, joshua.boltz: Move field classes out of preprocess and into templates

Issue #2229435 by lauriii, joelpittet, Rade: Clean up the way attributes are printed in field.html.twig.