Content-side changes for packaging. (#9382)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Packaging/Program.cs

@@ -0,0 +1,68 @@
+using System.Diagnostics;
+using System.IO.Compression;
+using Content.Packaging;
+using Robust.Packaging;
+using Robust.Packaging.AssetProcessing.Passes;
+using Robust.Packaging.Utility;
+using Robust.Shared.Timing;
+
+IPackageLogger logger = new PackageLoggerConsole();
+
+logger.Info("Clearing release/ directory");
+Directory.CreateDirectory("release");
+
+var skipBuild = args.Contains("--skip-build");
+
+if (!skipBuild)
+    WipeBin();
+
+await Build(skipBuild);
+
+async Task Build(bool skipBuild)
+{
+    logger.Info("Building project...");
+
+    if (!skipBuild)
+    {
+        await ProcessHelpers.RunCheck(new ProcessStartInfo
+        {
+            FileName = "dotnet",
+            ArgumentList =
+            {
+                "build",
+                Path.Combine("Content.Client", "Content.Client.csproj"),
+                "-c", "Release",
+                "--nologo",
+                "/v:m",
+                "/t:Rebuild",
+                "/p:FullRelease=true",
+                "/m"
+            }
+        });
+    }
+
+    logger.Info("Packaging client...");
+
+    var sw = RStopwatch.StartNew();
+
+    {
+        using var zipFile =
+            File.Open(Path.Combine("release", "SS14.Client.zip"), FileMode.Create, FileAccess.ReadWrite);
+        using var zip = new ZipArchive(zipFile, ZipArchiveMode.Update);
+        var writer = new AssetPassZipWriter(zip);
+
+        await ContentPackaging.WriteResources("", writer, logger, default);
+
+        await writer.FinishedTask;
+    }
+
+    logger.Info($"Finished packaging in {sw.Elapsed}");
+}
+
+
+void WipeBin()
+{
+    logger.Info("Clearing old build artifacts (if any)...");
+
+    Directory.Delete("bin", recursive: true);
+}