(css) Cleanup directives already in material

UI/WebServerResources/scss/components/divider/divider.scss

@@ -1,12 +1,2 @@
 /// divider.scss -*- Mode: scss; indent-tabs-mode: nil; basic-offset: 2 -*-
 @import 'extends';
-
-md-divider {
-  display: block;
-  border-top: 1px solid;
-  margin: 0;
-
-  &.md-inset {
-    margin-left: $baseline-grid * 9;
-  }
-}

UI/WebServerResources/scss/core/layout.scss

@@ -176,6 +176,7 @@ flex, hide, show, show-sm;
   margin-right: 0;
   margin-left: 0;
 }
+
 // App container for responsive
 .sg-app-content {
   @include to(sm) {

UI/WebServerResources/scss/core/mixins.scss

@@ -1,25 +1,6 @@
 /// mixins.scss -*- Mode: scss; indent-tabs-mode: nil; basic-offset: 2 -*-
 @import '../../angular-material/src/core/style/mixins.scss';
 
-@mixin margin-selectors($before:1em, $after:1em, $start:0px, $end:0px) {
-  -webkit-margin-before: $before;
-  -webkit-margin-after: $after;
-  -webkit-margin-start: $start;
-  -webkit-margin-end: $end;
-}
-
-@mixin not-selectable($value:none) {
-  user-select: $value;
-}
-
-@mixin input-placeholder-color($color) {
-  &::-webkit-input-placeholder,
-  &::-moz-placeholder, /* Firefox 19+ */
-  &:-moz-placeholder, /* Firefox 18- */
-  &:-ms-input-placeholder {
-    color: $color;
-  }
-}
 // Utility to compensate for the the xml mandatory attribute values
 // Creates classes extending layout attributes with no values
 // ----------------------------------------------------------------

UI/WebServerResources/scss/core/typography.scss

@@ -343,10 +343,10 @@ html p {
   white-space: nowrap;
 }
 .#{$md}-display-2--light {
-     $lineHeight: $sg-line-height-7;
-     font-size: $sg-font-size-7;
-     line-height: $lineHeight;
-     font-weight: $sg-font-light;
+  $lineHeight: $sg-line-height-7;
+  font-size: $sg-font-size-7;
+  line-height: $lineHeight;
+  font-weight: $sg-font-light;
  }
 .#{$md}-display-3 {
   $lineHeight : $sg-line-height-8;