Webtoon fixes + Random release stuff (#1048)

* Refactored the way cover images are updated from SignalR to use an explicit event that is sent at a granular level for a given type of entity.

Fixed a bad event listener for RefreshMetadata (now removed) to update metadata on Series Detail. Now uses ScanService, which indicates a series has completed a scan.

* Lots of attempts at making webtoon stable. Kinda working kinda not.

* Added a new boolean to hide images until the first prefetch loads the images, to prevent jankiness

* On Search, remove : from query

* Added HasBookmark and NumberOfLibraries to stat service

* Cleaned up some dead code

* Fixed a bug where page number wasn't reset between chapter loads with infinite scroller

* Added recently added series back into the dashboard.

* Cleaned up some code in search bar

API/Controllers/LibraryController.cs

@@ -227,7 +227,7 @@ namespace API.Controllers
         [HttpGet("search")]
         public async Task<ActionResult<SearchResultGroupDto>> Search(string queryString)
         {
-            queryString = Uri.UnescapeDataString(queryString).Trim().Replace(@"%", string.Empty);
+            queryString = Uri.UnescapeDataString(queryString).Trim().Replace(@"%", string.Empty).Replace(":", string.Empty);
 
             var user = await _unitOfWork.UserRepository.GetUserByUsernameAsync(User.GetUsername());
             // Get libraries user has access to