Parser followup (#2377)

* set pipe to empty string on empty closure

* fix missing parser flags and scope

* add closure serializing

* add enum provider function to slash command arguments

* add enum providers for /bg, /ask, and /go

* fix index out of bounds returning undefined

* keep whitespace as is in mixed unnamed args (string+closure)

* add _hasUnnamedArgument to named arguments dictionary

* allow /var key=x retrieval

* add enum provider to /tag-add

* fix typo (case)

* add option to make enum matching optional

* add executor to enum provider

* change /tag-add enum provider to only show tags not already assigned

* add enum provider to /tag-remove

* fix name enum provider excluding groups

* remove void from slash command callback return types

* Lint undefined and null pipes

* enable pointer events in chat autocomplete

* fix type hint

---------

Co-authored-by: LenAnderson <Anderson.Len@outlook.com>
Co-authored-by: Cohee <18619528+Cohee1207@users.noreply.github.com>

public/scripts/slash-commands/SlashCommandEnumValue.js

@@ -1,10 +1,14 @@
 export class SlashCommandEnumValue {
     /**@type {string}*/ value;
     /**@type {string}*/ description;
+    /**@type {string}*/ type = 'enum';
+    /**@type {string}*/ typeIcon = '◊';
 
-    constructor(value, description = null) {
+    constructor(value, description = null, type = 'enum', typeIcon = '◊') {
         this.value = value;
         this.description = description;
+        this.type = type;
+        this.typeIcon = typeIcon;
     }
 
     toString() {