Namespace cleanup, move some categories out of UI namespace

src/CSConsole/Lexers/Lexer.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+namespace UnityExplorer.CSConsole.Lexers
+{
+    public abstract class Lexer
+    {
+        public virtual IEnumerable<char> Delimiters => Enumerable.Empty<char>();
+
+        protected abstract Color HighlightColor { get; }
+
+        public string ColorTag => colorTag ?? (colorTag = "<color=#" + HighlightColor.ToHex() + ">");
+        private string colorTag;
+
+        public abstract bool TryMatchCurrent(LexerBuilder lexer);
+    }
+}