[style] Cleanup of Styleline violations

Allowing up to 4 decimal places in order to get 13px from the 16px
default size.

Having "@extend" come before "@include" and other rules to minimize its
use being overlooked. Extending classes and placeholders can lead to
some tricky rendered styles, so the use definitely needs to be done
judiciously.

css/bladeburner.scss

@@ -34,22 +34,22 @@
 }
 
 .bladeburner-nav-button {
-    color: #fff;
-
     @extend %bladburner-nav-button;
 
+    color: #fff;
+
     &:hover {
         background-color: #3d4044;
     }
 }
 
 .bladeburner-nav-button-inactive {
+    @extend %bladburner-nav-button;
+
     text-decoration: none;
     background-color: #555;
     cursor: default;
     pointer-events: none;
-
-    @extend %bladburner-nav-button;
 }
 
 /* Bladeburner Console */

css/loader.scss

@@ -56,30 +56,27 @@
     }
 
     .loaderspinner {
+        @extend %spinnerBox;
         @include animation(LOADERSPINNER 5s linear infinite);
 
         width: $spinnerBoxSize;
         height: $spinnerBoxSize;
-
-        @extend %spinnerBox;
     }
 
     .loaderspinner:before {
+        @extend %spinnerBox;
         @include animation(LOADERSPINNER 10s linear infinite);
 
         width: $spinnerBoxSize * 0.8;
         height: $spinnerBoxSize * 0.8;
-
-        @extend %spinnerBox;
     }
 
     .loaderspinner:after {
+        @extend %spinnerBox;
         @include animation(LOADERSPINNER 5s linear infinite);
 
         width: $spinnerBoxSize * 0.6;
         height: $spinnerBoxSize * 0.6;
-
-        @extend %spinnerBox;
     }
 
     .loaderlabel {

stylelint.config.js

@@ -130,13 +130,17 @@ module.exports = {
         "no-missing-end-of-source-newline": true,
         "no-unknown-animations": true,
         "number-leading-zero": "always",
-        "number-max-precision": [3, { ignoreUnits: [ "%" ] }],
+        "number-max-precision": [4, { ignoreUnits: [ "%" ] }],
 //        "number-no-trailing-zeros": true,
         "order/order": [
             [
                 "dollar-variables",
                 "at-variables",
                 "custom-properties",
+                {
+                    type: "at-rule",
+                    name: "extend"
+                },
                 {
                     type: "at-rule",
                     name: "include"