list: cleanup, include offset in DateAttempt

included UTC offset in minutes in DateAttempt, will be used shortly.
Also moved this stuff (ParsedDate, DateAttempt) to the common d.ts, and
the method for parsing from a string (now parseDateString) to common.
Also pre-emptively load the user cache when the admin page loads.

ts/modules/search.ts

@@ -1,4 +1,5 @@
-const dateParser = require("any-date-parser");
+import { ListItem } from "./list";
+import { parseDateString } from "./common";
 
 declare var window: GlobalWindow;
 
@@ -176,20 +177,6 @@ export class StringQuery extends Query {
     }
 }
 
-export interface DateAttempt {
-    year?: number;
-    month?: number;
-    day?: number;
-    hour?: number;
-    minute?: number
-}
-
-export interface ParsedDate {
-    attempt: DateAttempt;
-    date: Date;
-    text: string;
-};
-    
 const dateGetters: Map<string, () => number> = (() => {
     let m = new Map<string, () => number>();
     m.set("year", Date.prototype.getFullYear);
@@ -222,24 +209,15 @@ export class DateQuery extends Query {
         <span class="font-bold mr-2">${subject.name}:</span> ${dateText != "" ? dateText+" " : ""}${value.text}
         `;
     }
+
     public static paramsFromString(valueString: string): [ParsedDate, QueryOperator, boolean] {
-        // FIXME: Validate this!
         let op = QueryOperator.Equal;
         if ((Object.values(QueryOperator) as string[]).includes(valueString.charAt(0))) {
             op = valueString.charAt(0) as QueryOperator;
             // Trim the operator from the string
             valueString = valueString.substring(1);
         }
-
-        let out: ParsedDate = {
-            text: valueString,
-            // Used just to tell use what fields the user passed.
-            attempt: dateParser.attempt(valueString),
-            // note Date.fromString is also provided by dateParser.
-            date: (Date as any).fromString(valueString) as Date
-        };
-        // Month in Date objects is 0-based, so make our parsed date that way too
-        if ("month" in out.attempt) out.attempt.month -= 1;
+        let out = parseDateString(valueString);
         let isValid = true;
         if ("invalid" in (out.date as any)) { isValid = false; };
         
@@ -278,10 +256,8 @@ export class DateQuery extends Query {
     }
 }
 
-export interface SearchableItem {
+export interface SearchableItem extends ListItem {
     matchesSearch: (query: string) => boolean;
-    // FIXME: SearchableItem should really be ListItem or something, this isn't for search!
-    asElement: () => HTMLElement;
 }
 
 export const SearchableItemDataAttribute = "data-search-item";
@@ -598,7 +574,6 @@ export class Search {
         this._c.search.oninput(null as any);
     };
 
-    // FIXME: Make XQuery classes less specifically for in-progress searches, and include this code for making info button things.
     generateFilterList = () => {
         // Generate filter buttons
         for (let queryName of Object.keys(this._c.queries)) {