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/admin/dashboard/dashboard.component.ts

@@ -4,6 +4,7 @@ import { ToastrService } from 'ngx-toastr';
 import { ServerService } from 'src/app/_services/server.service';
 import { saveAs } from 'file-saver';
 import { Title } from '@angular/platform-browser';
+import { DownloadService } from 'src/app/shared/_services/download.service';
 
 
 
@@ -23,7 +24,8 @@ export class DashboardComponent implements OnInit {
   counter = this.tabs.length + 1;
   active = this.tabs[0];
 
-  constructor(public route: ActivatedRoute, private serverService: ServerService, private toastr: ToastrService, private titleService: Title) {
+  constructor(public route: ActivatedRoute, private serverService: ServerService, 
+    private toastr: ToastrService, private titleService: Title, private downloadService: DownloadService) {
     this.route.fragment.subscribe(frag => {
       const tab = this.tabs.filter(item => item.fragment === frag);
       if (tab.length > 0) {
@@ -46,10 +48,7 @@ export class DashboardComponent implements OnInit {
   }
 
   fetchLogs() {
-    this.serverService.fetchLogs().subscribe(res => {
-      const blob = new Blob([res], {type: 'text/plain;charset=utf-8'});
-      saveAs(blob, 'kavita.zip');
-    });
+    this.downloadService.downloadLogs();
   }
 
 }

UI/Web/src/app/admin/manage-settings/manage-settings.component.scss

@@ -1,11 +1,8 @@
-@import '../../../assets/themes/dark.scss';
-
 .accent {
     font-style: italic;
     font-size: 0.7rem;
-    background-color: $dark-form-background;
+    background-color: lightgray;
     padding: 10px;
-    color: lightgray;
+    color: black;
     border-radius: 6px;
-    box-shadow: inset 0px 0px 8px 1px $dark-form-background
 }