Add UIGlow and UIForeground SeString payloads; refactor some handling of integer markers in payloads, to make encoding a bit simpler

Dalamud/Game/Chat/SeStringHandling/Payloads/UIGlowPayload.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Dalamud.Game.Chat.SeStringHandling.Payloads
+{
+    public class UIGlowPayload : Payload
+    {
+        public override PayloadType Type => PayloadType.UIGlow;
+
+        public ushort RawColor { get; private set; }
+
+        //public int Red { get; private set; }
+        //public int Green { get; private set; }
+        //public int Blue { get; private set; }
+
+        public override byte[] Encode()
+        {
+            var colorBytes = MakeInteger(RawColor);
+            var chunkLen = colorBytes.Length + 1;
+
+            var bytes = new List<byte>(new byte[]
+            {
+                START_BYTE, (byte)SeStringChunkType.UIGlow, (byte)chunkLen
+            });
+
+            bytes.AddRange(colorBytes);
+            bytes.Add(END_BYTE);
+
+            return bytes.ToArray();
+        }
+
+        public override void Resolve()
+        {
+            // TODO: resolve color keys to hex colors via UIColor table
+        }
+
+        public override string ToString()
+        {
+            return $"{Type} - RawColor: {RawColor}";
+        }
+
+        protected override void ProcessChunkImpl(BinaryReader reader, long endOfStream)
+        {
+            RawColor = (ushort)GetInteger(reader);
+        }
+
+        protected override byte GetMarkerForIntegerBytes(byte[] bytes)
+        {
+            return bytes.Length switch
+            {
+                // a single byte of 0x01 is used to 'disable' color, and has no marker
+                1 => (byte)IntegerType.None,
+                _ => base.GetMarkerForIntegerBytes(bytes)
+            };
+        }
+    }
+}