Issue #2009574 by e2tha_e, adamcowboy, Samvel, jenlampton: Replace theme() with drupal_render() in forum module.

Issue #2008970 by markie, StephaneQ, adamcowboy | thedavidmeister: Replace theme() with drupal_render() in aggregator module.

Issue #1963476 by widukind, joelpittet, jenlampton, tlattimore, kattekrab, siccababes, adamcowboy: Datetime.module - Convert theme_ functions to Twig.

Issue #2009680 by DarthDrupal, cwells73, Samvel, adamcowboy, hussainweb: Fixed Replace theme() with drupal_render() in taxonomy module.

Issue #2008982 by xxAlHixx, adamcowboy, hussainweb, c4rl: Replace theme() with drupal_render() in config module.