Remove unused using declarations in CLI/Generator.cs.

Author: tritao

src/CLI/Generator.cs

@@ -4,11 +4,9 @@
 using CppSharp.Passes;
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Text;
-using System.Text.RegularExpressions;
 using CppAbi = CppSharp.Parser.AST.CppAbi;
 
 namespace CppSharp