Revert "Issue #2656278 by miteshmap, walangitan, empesan, ejb503, manmohandream, vaidehi bapat, gadaniels72, luca_cracco, swentel, malaimo29001, nileema.jadhav, sidharthap: Convert "Limit allowed HTML tags" input field to a textarea"

This reverts commit 53766025.

Issue #2656278 by miteshmap, walangitan, empesan, ejb503, manmohandream, vaidehi bapat, gadaniels72, luca_cracco, swentel, malaimo29001, nileema.jadhav, sidharthap: Convert "Limit allowed HTML tags" input field to a textarea

Issue #2548195 by nod_, JohnAlbin, madhavvyas, sriharsha.uppuluri: Only use single quotes in JavaScript and update .eslintrc

Issue #2549077 by pwolanin, Wim Leers, phenaproxima, lauriii: Allow the "Limit allowed HTML tags" filter to also restrict HTML attributes, and only allow a small whitelist of attributes by default

Issue #2473945 by Cottser, rachel_norfolk, axe312, davidhernandez, yannickoo, emma.maria, cilefen, akalata, jaxxed, LewisNyman: Prefix form-item classes with js-

Issue #2383865 by mgifford, pguillard, rpayanm, alexpott, jhodgdon: Spellchecking Drupal - Javascript

Issue #1913510 by erich_s, jibran, scresante, nod_, mitron: Core Javascript Files Not Using Standard Indentation.

Issue #1894644 by Wim Leers, quicksketch: Unidirectional editor configuration -> filter settings syncing.