SCSS support tools

Signed-off-by: Valentin Popov <info@valentineus.link>

_scss/utilities/_textsizeadjust.scss

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+// Text Size Adjust
+//
+// The text-size-adjust CSS property controls the text inflation algorithm used on some smartphones and tablets. Other browsers will ignore this property.
+//
+// Values: none | auto | <percentage>
+// Default: none
+//
+// https://drafts.csswg.org/css-size-adjust/#adjustment-control
+@mixin text-size-adjust($value: none) {
+  -webkit-text-size-adjust: $value;
+     -moz-text-size-adjust: $value;
+      -ms-text-size-adjust: $value;
+}