Update SCSS to module system (fixes #266)

Change-Id: I2387ef49dadaeac0f62620e0c803df12dad42cf8
diff --git a/dev/scss/header/statistics.scss b/dev/scss/header/statistics.scss
index 500fc70..0776b13 100644
--- a/dev/scss/header/statistics.scss
+++ b/dev/scss/header/statistics.scss
@@ -1,5 +1,8 @@
 @charset "utf-8";
-@import "../util";
+@use "../util";
+@use "../base/colors";
+@use "../base/icons";
+@use "../base/lengths";
 
 
 /**
@@ -9,7 +12,7 @@
 div.stattable {
   display: flex;
   flex-direction: row;
-  margin-right: $right-view-distance;
+  margin-right: lengths.$right-view-distance;
 }
 
 div.stattable {
@@ -17,10 +20,10 @@
     margin-bottom:4px;
 
     > div {
-      border-color: $dark-green;
+      border-color: colors.$dark-green;
 
       > dt {
-        background-color: $middle-green;
+        background-color: colors.$middle-green;
         width:            15em;
         margin:           0;
 
@@ -29,8 +32,8 @@
         }
       }   
       > dd {
-        background-color: $lightest-green;
-        color:            $dark-grey;
+        background-color: colors.$lightest-green;
+        color:            colors.$dark-grey;
       }
     }
   }
@@ -38,8 +41,8 @@
   &.stdisabled {
     dt,
     dd {
-      background-color: $grey-green;
-      color:            $dark-green;
+      background-color: colors.$grey-green;
+      color:            colors.$dark-green;
       text-shadow:      none;
     }
   }
@@ -53,7 +56,7 @@
 
 span.refresh::after{
   vertical-align: sub;
-  content :       $fa-redo;
+  content :       icons.$fa-redo;
 }
 
 // Default value 20% doesn't work with < 5 items,