Allow argument chaining.

Example to extract test.gma into test and afterwards overwriting test.gma using files in test2:
  gmadsharp extract test.gma test create test2 test.gma

src/addoncreator/Program.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
+using System.Text;
 using GarrysMod.AddonCreator.Addon;
 
 namespace GarrysMod.AddonCreator
@@ -9,6 +10,8 @@ namespace GarrysMod.AddonCreator
     internal static class Program
     {
         private static void Main(string[] args)
+        {
+            while (args.Any())
             {
                 switch (args.Length == 0 ? "" : args[0])
                 {
@@ -34,8 +37,8 @@ namespace GarrysMod.AddonCreator
                         foreach (var file in folder.EnumerateFiles("*", SearchOption.AllDirectories))
                         {
                             var relpath =
-                            MakeRelativePath(folder.FullName, file.FullName).Replace(Path.DirectorySeparatorChar, '/');
+                                MakeRelativePath(folder.FullName, file.FullName)
-                        Console.WriteLine("Adding: {0}", relpath);
+                                    .Replace(Path.DirectorySeparatorChar, '/');
 
                             addon.Files.Add(relpath, new PhysicalAddonFileInfo(file.FullName));
                         }
@@ -45,8 +48,10 @@ namespace GarrysMod.AddonCreator
                         addon.Export(output);
 
                         Console.WriteLine("Done.");
+                        args = args.Skip(3).ToArray();
                         break;
                     }
+
                     case "extract":
                     {
                         if (args.Length < 3)
@@ -90,7 +95,8 @@ namespace GarrysMod.AddonCreator
                         {
                             var relpath = file.Key;
                             var targetFile =
-                            new FileInfo(Path.Combine(folder.FullName, relpath.Replace('/', Path.DirectorySeparatorChar)));
+                                new FileInfo(Path.Combine(folder.FullName,
+                                    relpath.Replace('/', Path.DirectorySeparatorChar)));
 
                             Console.WriteLine("Extracting: {0}", relpath);
 
@@ -116,12 +122,16 @@ namespace GarrysMod.AddonCreator
                                     }
                                     fs.Write(toWriteBuf.ToArray(), 0, toWrite);
                                 }
+
+                                fs.Flush();
                             }
                         }
 
                         Console.WriteLine("Done.");
+                        args = args.Skip(3).ToArray();
                         break;
                     }
+
                     default:
                         Console.WriteLine("Usage: {0} <command> <arguments>", Process.GetCurrentProcess().ProcessName);
                         Console.WriteLine();
@@ -131,7 +141,8 @@ namespace GarrysMod.AddonCreator
                         Console.WriteLine("\t{0}\t{1}", "create", "Creates a GMA file.");
                         Console.WriteLine("\t\tArguments: Input folder path, output GMA file path");
                         Console.WriteLine();
-                    break;
+                        return;
+                }
             }
         }