Angular 15 (#1764)

* Updated ngx-virtual-scroller

* Removed the karma test config as it's breaking migration

* Reverted to pre angular 15

* Upgraded packages and reverted target to ES6 for older devices

* It's broken. Need to also find the safari version for old Ipads

* Fixes some code in default pipe and many updates to packages. Removed support for old iOS versions as it restricted Kavita from using newer features. Build still broken.

* More progress in getting build working on Angular 15. Removed polyfills.ts for new angular config

* Remove all.css for icons and use scss instead

* Removed stuff that isn't needed

* Migrated extended linting to eslint, ran on project and updated issues. Removed a duplicate component that did nothing. Fixed a few places where lifecycle hooks werent being called as interface wasn't implemented.

* App builds correctly. Source maps are still needed.

* Fixed source maps and removed more testing stuff. I will re-add later in another release when I figure out how to properly tackle dependencies on backend.

* Reverted back to old source map definition

UI/Web/src/app/nav/_components/grouped-typeahead/grouped-typeahead.component.html

@@ -1,5 +1,5 @@
 <form [formGroup]="typeaheadForm" class="grouped-typeahead">
-      <div class="typeahead-input" [ngClass]="{'focused': hasFocus == true}" (click)="onInputFocus($event)">
+      <div class="typeahead-input" [ngClass]="{'focused': hasFocus}" (click)="onInputFocus($event)">
         <div class="search">
           <input #input [id]="id" type="text" autocomplete="off" formControlName="typeahead" [placeholder]="placeholder"
           aria-haspopup="listbox" aria-owns="dropdown" aria-expanded="hasFocus && (grouppedData.persons.length || grouppedData.collections.length || grouppedData.series.length || grouppedData.persons.length || grouppedData.tags.length || grouppedData.genres.length)"