Cleaned 2 obsolete entries and reordered the rest

Removed 3 (more or less) Go specific entries that were needed in the
past, but now with the `language-go` package being improved, these are
not needed/used anymore.

So `.support.function.decl`, `.keyword.operator.bracket` and
`.keyword.operator.punctuation` are deleted (they were previously all
added by me specifically for supporting `language-go` better, so it
should be save to remove them again now they aren’t used anymore).

For the rest I reordered the entries to be alphabetical to make it a
little cleaner and easier to find entries.

index.less

@@ -89,45 +89,28 @@ atom-text-editor, :host {
   color: #75715E;
 }
 
-.string {
-  color: #E6DB74;
-}
-
-.constant.numeric {
-  color: #AE81FF;
-}
-
-.constant.language {
+.constant {
   color: #AE81FF;
 }
 
-.constant.character,
-.constant.escape,
-.constant.other {
-  color: #AE81FF;
+.entity.name.class {
+  text-decoration: none;
+  color: #A6E22E;
 }
 
-.keyword {
-  color: #F92672;
+.entity.name.function {
+  color: #A6E22E;
 }
 
-.keyword.operator.bracket,
-.keyword.operator.punctuation,
- {
-  color: #FFFFFF;
+.entity.name.instance {
+  color: #66D9EF;
 }
 
-.storage {
+.entity.name.tag {
   color: #F92672;
 }
 
-.storage.type {
-  font-style: italic;
-  color: #66D9EF;
-}
-
-.entity.name.class {
-  text-decoration: none;
+.entity.other.attribute-name {
   color: #A6E22E;
 }
 
@@ -137,59 +120,56 @@ atom-text-editor, :host {
   color: #A6E22E;
 }
 
-// Prevent underlines from making their way into whitespace elements
-.leading-whitespace,
-.trailing-whitespace {
-  display: inline-block;
-}
-
-.entity.name.function {
-  color: #A6E22E;
-}
-
-.entity.name.instance {
-  color: #66D9EF;
+.invalid {
+  color: #F8F8F0;
+  background-color: #F92672;
 }
 
-.variable.parameter {
-  font-style: italic;
-  color: #FD971F;
+.invalid.deprecated {
+  color: #F8F8F0;
+  background-color: #AE81FF;
 }
 
-.entity.name.tag {
+.keyword {
   color: #F92672;
 }
 
-.entity.other.attribute-name {
-  color: #A6E22E;
+.storage {
+  color: #F92672;
 }
 
-.support.function {
+.storage.type {
+  font-style: italic;
   color: #66D9EF;
 }
 
-.support.function.decl {
-  color: #A6E22E;
+.string {
+  color: #E6DB74;
 }
 
 .support.constant {
   color: #66D9EF;
 }
 
-.support.type,
-.support.class {
+.support.function {
+  color: #66D9EF;
+}
+
+.support.class,
+.support.type {
   font-style: italic;
   color: #66D9EF;
 }
 
-.invalid {
-  color: #F8F8F0;
-  background-color: #F92672;
+.variable.parameter {
+  font-style: italic;
+  color: #FD971F;
 }
 
-.invalid.deprecated {
-  color: #F8F8F0;
-  background-color: #AE81FF;
+// Prevent underlines from making their way into whitespace elements
+.leading-whitespace,
+.trailing-whitespace {
+  display: inline-block;
 }
 
 // Jade syntax
@@ -198,7 +178,10 @@ atom-text-editor, :host {
 }
 
 // 'self' Python
-.variable.language.python,
+.variable.language.python {
+  color: #F92672;
+}
+
 // 'this' Javascript
 .variable.language.js {
   color: #F92672;