OPDS Cleanup (#534)

* Fixed opds url display

* Rewrote how stat collection works, now we check in multiple places and always run stat collection in a background thread, to not block main thread.

* Cleaned up the ParseInfoTest to be more verbose

* Added benchmarking

API.Benchmark/Program.cs

@@ -0,0 +1,18 @@
+using BenchmarkDotNet.Running;
+
+namespace API.Benchmark
+{
+    /// <summary>
+    /// To build this, cd into API.Benchmark directory and run
+    /// dotnet build -c Release
+    /// then copy the outputted dll
+    /// dotnet copied_string\API.Benchmark.dll
+    /// </summary>
+    public class Program
+    {
+        static void Main(string[] args)
+        {
+            BenchmarkRunner.Run<ParseScannedFilesBenchmarks>();
+        }
+    }
+}