Fixes #12672

Update less.js to v1.6.3.

Update dependencies.

Fix multistr errors in customizer.js

Fix scrollspy typo in docs.css

Use .bs-example-* instead of .bs-* in examples in docs

Refs #12610

Fixes #11659, #12698, and #12349: Always apply position and z-index form controls in input groups for proper borders

rm BrowserStack testing from build

Fixed transitions on offcanvas example by adding initial left and right properties

Conflicts:
	dist/css/bootstrap-theme.css.map
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
	docs/assets/js/customize.min.js
	docs/assets/js/raw-files.min.js
	docs/dist/css/bootstrap-theme.css.map
	docs/dist/css/bootstrap.css.map
	docs/dist/css/bootstrap.min.css
	test-infra/npm-shrinkwrap.canonical.json

Remove execute permission on font files

use @popover-arrow-width for offset the popover 

* The problem with #12674 is that it reassigns the same variable, but the color values were purposely different.
* This uses Less's color functions to generate the proper darker colors.
* Why darker colors? Because those CSS carets render lighter than their solid border counterparts. Consider it a design hack.

Update teams

chrome => googlechrome in Sauce