Add tests for ass parser

tests/Jellyfin.MediaEncoding.Tests/Subtitles/AssParserTests.cs

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+using System;
+using System.Globalization;
+using System.IO;
+using System.Threading;
+using MediaBrowser.MediaEncoding.Subtitles;
+using Xunit;
+
+namespace Jellyfin.MediaEncoding.Subtitles.Tests
+{
+    public class AssParserTests
+    {
+        [Fact]
+        public void Parse_Valid_Success()
+        {
+            using (var stream = File.OpenRead("Test Data/example.ass"))
+            {
+                var parsed = new AssParser().Parse(stream, CancellationToken.None);
+                Assert.Single(parsed.TrackEvents);
+                var trackEvent = parsed.TrackEvents[0];
+
+                Assert.Equal("1", trackEvent.Id);
+                Assert.Equal(TimeSpan.Parse("00:00:01.18", CultureInfo.InvariantCulture).Ticks, trackEvent.StartPositionTicks);
+                Assert.Equal(TimeSpan.Parse("00:00:06.85", CultureInfo.InvariantCulture).Ticks, trackEvent.EndPositionTicks);
+                Assert.Equal("Like an Angel with pity on nobody\r\nThe second line in subtitle", trackEvent.Text);
+            }
+        }
+
+        [Fact]
+        public void ParseFieldHeaders_Valid_Success()
+        {
+            const string Line = "Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text";
+            var headers = AssParser.ParseFieldHeaders(Line);
+            Assert.Equal(1, headers["Start"]);
+            Assert.Equal(2, headers["End"]);
+            Assert.Equal(9, headers["Text"]);
+        }
+    }
+}

tests/Jellyfin.MediaEncoding.Tests/Test Data/example.ass

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+[Script Info]
+; Script generated by Aegisub
+; http://www.aegisub.org
+Title: Neon Genesis Evangelion - Episode 26 (neutral Spanish)
+Original Script: RoRo
+Script Updated By: version 2.8.01
+ScriptType: v4.00+
+Collisions: Normal
+PlayResY: 600
+PlayDepth: 0
+Timer: 100,0000
+Video Aspect Ratio: 0
+Video Zoom: 6
+Video Position: 0
+
+[V4+ Styles]
+Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
+Style: DefaultVCD, Arial,28,&H00B4FCFC,&H00B4FCFC,&H00000008,&H80000008,-1,0,0,0,100,100,0.00,0.00,1,1.00,2.00,2,30,30,30,0
+
+[Events]
+Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
+Dialogue: 0,0:00:01.18,0:00:06.85,DefaultVCD, NTP,0000,0000,0000,,{\pos(400,570)}Like an Angel with pity on nobody\NThe second line in subtitle