Since time ago I've been thinking how to improve theme quality removing our Twig functions to handle aviability of user defined style vs proper text color. Best solution was move all those handlings to SASS functions and apply required modifications there. Now the code is much simpler, easy to understand, and let you add as many colors/styles as you desire.

Today template received a major update of Bootstrap 4.3.1 which includes a lot of improvements, SASS reestructured, new theme options and fixes.