Feature/performance pdf (#426)

#  Added
- Added: Added series format information to the search typeahead to help identify duplicate series in libraries

# Fixed
- Fixed: Fixed accent color not looking well on light theme
- Fixed: Attempted to fix the memory issues with PDF reading on Docker. Uses a Memory Pool for streams and removes a bitmap operation for fixing books with transparent backgrounds (#424)

# Changed
- Changed: Refactored download logs to use the same download code as rest of Kavita 

# Dev stuff
- Added timeout for Regex's to make sure during matching, malicious filenames doesn't crash user system
- Refactored a missing GetCoverImage to use Series Format rather than old Library Type

==================================================
* Added Timeout for Regex matching to ensure malicious filenames don't crash system

* Refactored GetCoverImage to use series format rather than library type

* Refactored download logs to use the download service

* Fixed accent color not looking well on light theme

* Refactored series format into dedicated component and added to search results

* Switch to using MemoryManager for Streams to attempt to minimize GC pressure and reduced bitmap manipulation for transparency hack.

UI/Web/src/app/nav-header/nav-header.component.ts

@@ -3,6 +3,7 @@ import { Component, HostListener, Inject, OnDestroy, OnInit, ViewChild } from '@
 import { Router } from '@angular/router';
 import { Subject } from 'rxjs';
 import { takeUntil } from 'rxjs/operators';
+import { UtilityService } from '../shared/_services/utility.service';
 import { SearchResult } from '../_models/search-result';
 import { AccountService } from '../_services/account.service';
 import { ImageService } from '../_services/image.service';