Bump Fullcalendar from 6.1.20 to 7.0.0 amd convert existing code to comply with 7.0, also make calendar more printable

plugins/fullcalendar/packages/core/locales/en-gb.global.js

@@ -1,29 +0,0 @@
-/*!
-FullCalendar Core v6.1.20
-Docs & License: https://fullcalendar.io
-(c) 2024 Adam Shaw
-*/
-(function (index_js) {
-    'use strict';
-
-    var locale = {
-        code: 'en-gb',
-        week: {
-            dow: 1,
-            doy: 4, // The week that contains Jan 4th is the first week of the year.
-        },
-        buttonHints: {
-            prev: 'Previous $0',
-            next: 'Next $0',
-            today: 'This $0',
-        },
-        viewHint: '$0 view',
-        navLinkHint: 'Go to $0',
-        moreLinkHint(eventCnt) {
-            return `Show ${eventCnt} more event${eventCnt === 1 ? '' : 's'}`;
-        },
-    };
-
-    index_js.globalLocales.push(locale);
-
-})(FullCalendar);