Fixes #14234: Reset the hack IE8-10 with another hack just for IE11 for temporal inputs and line-height

Fixes #13202: Always use overflow: auto; on .table-responsive to prevent content breaking out of containers

Fixes #14095: Add basic styling for captions, which we've for some reason been missing all this time.

Fixes #13974, #14123: Remove translate3d repaint performance enhancement for text rendering and position wonkiness

Refactor navs: new classes, remove separate pills & tabs files, drop justified nav because it never really worked

Drop the deprecated .visible-* classes (because we replaced them with .visible-*-block, -inline-block, -inline

rems: update breadcrumbs to use new sizing; improve variables by renaming @breadcrumb-separator to @breadcrumb-divider; change up colors