(#196) Install and Configure Stylelint

Closes #196

* Added `stylelint`, `stylelint-config-standard` and `post-less`
* Configured Stylelint, added rules, and fixed remaining console errors
* Removed empty style declaration blocks

Author: Oluwaseun Longe

.gitignore

@@ -3,6 +3,7 @@ node_modules
 api-cache
 tmp
 .vscode
+.idea
 
 # auto-gen PHP files/logs
 php_errors.log

.stylelintrc.json

@@ -0,0 +1,43 @@
+{
+    "customSyntax": "postcss-less",
+    "extends": "stylelint-config-standard",
+    "ignoreFiles": ["**/*.js"],
+    "rules": {
+        "alpha-value-notation": null,
+        "at-rule-empty-line-before": null,
+        "at-rule-no-unknown": null,
+        "color-function-notation": null,
+        "color-hex-length": null,
+        "comment-empty-line-before": null,
+        "comment-whitespace-inside": null,
+        "custom-property-empty-line-before": null,
+        "custom-property-pattern": null,
+        "declaration-empty-line-before": null,
+        "declaration-block-no-duplicate-properties": null,
+        "declaration-block-no-redundant-longhand-properties": null,
+        "declaration-block-no-shorthand-property-overrides": null,
+        "font-family-name-quotes": null,
+        "font-family-no-missing-generic-family-keyword": null,
+        "function-name-case": null,
+        "function-no-unknown": null,
+        "function-url-quotes": null,
+        "import-notation": null,
+        "keyframes-name-pattern": null,
+        "length-zero-no-unit": null,
+        "media-feature-range-notation": null,
+        "media-query-no-invalid": null,
+        "no-descending-specificity": null,
+        "no-duplicate-selectors": null,
+        "property-no-unknown": null,
+        "property-no-vendor-prefix": null,
+        "rule-empty-line-before": null,
+        "selector-class-pattern": null,
+        "selector-id-pattern": null,
+        "selector-no-vendor-prefix": null,
+        "selector-pseudo-element-colon-notation": null,
+        "shorthand-property-no-redundant-values": null,
+        "string-no-newline": null,
+        "value-keyword-case": null,
+        "value-no-vendor-prefix": null
+    }
+}

less/enable-flyout.less

@@ -508,9 +508,6 @@
                 right: (230 / @px);
 
                 & .enable-flyout {
-                    &__menu-item {
-                    }
-
                     &__link {
                         padding: 17px 0;
                         margin: -17px 0;

less/shared/mixins-and-vars.less

@@ -221,9 +221,6 @@
     box-shadow: @arguments;
 }
 
-.viewport-scale() {
-}
-
 // This mixin allows focus rules for (mostly) keyboard only.
 // It is based on this great blog post above :focus-visible
 //

less/sortable-tables.less

@@ -31,8 +31,6 @@
             th .sortableColumnLabel:hover {
                 outline: 1px dashed #767676;
             }
-            th .sortableColumnLabel:after {
-            }
             th button {
                 color: white;
                 background: transparent;

less/spinbutton.less

@@ -56,9 +56,6 @@ input[type="number"] {
             background-color: #faf7f0;
         }
     }
-
-    .spin-button {
-    }
 }
 
 label.sbLabel {

less/tabs.less

@@ -1,7 +1,4 @@
 @import "shared/mixins-and-vars";
-.zoltan {
-    this: that;
-}
 
 #tabs h2 {
     margin: 0.5em 0;