Refactor host user security model, support static assets in modules and themes, module definition permissions and categories, paging control, remove SiteUsers, move seed data from script to site template for installation

Oqtane.Server/Infrastructure/IInstallation.cs

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+namespace Oqtane.Infrastructure
+{
+    public interface IInstallation
+    {
+        void Install(string Folders);
+    }
+}

Oqtane.Server/Infrastructure/Installation.cs

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+using System.Reflection;
+using System.IO;
+using System.IO.Compression;
+using Microsoft.Extensions.Hosting;
+using Microsoft.AspNetCore.Hosting;
+
+namespace Oqtane.Infrastructure
+{
+    public class Installation  : IInstallation
+    {
+        private readonly IHostApplicationLifetime HostApplicationLifetime;
+        private readonly IWebHostEnvironment environment;
+
+        public Installation(IHostApplicationLifetime HostApplicationLifetime, IWebHostEnvironment environment)
+        {
+            this.HostApplicationLifetime = HostApplicationLifetime;
+            this.environment = environment;
+        }
+
+        public void Install(string Folders)
+        {
+            bool install = false;
+            string binfolder = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
+
+            foreach (string Folder in Folders.Split(','))
+            {
+                string folder = Path.Combine(environment.WebRootPath, Folder);
+
+                // iterate through theme packages
+                foreach (string packagename in Directory.GetFiles(folder, "*.nupkg"))
+                {
+                    string name = Path.GetFileNameWithoutExtension(packagename);
+                    string[] segments = name.Split('.');
+                    name = string.Join('.', segments, 0, segments.Length - 3);
+
+                    // iterate through files and deploy to appropriate locations
+                    using (ZipArchive archive = ZipFile.OpenRead(packagename))
+                    {
+                        foreach (ZipArchiveEntry entry in archive.Entries)
+                        {
+                            string filename = Path.GetFileName(entry.FullName);
+                            switch (Path.GetExtension(filename))
+                            {
+                                case ".dll":
+                                    entry.ExtractToFile(Path.Combine(binfolder, filename), true);
+                                    break;
+                                case ".png":
+                                case ".jpg":
+                                case ".jpeg":
+                                case ".gif":
+                                case ".svg":
+                                case ".js":
+                                case ".css":
+                                    entry.ExtractToFile(folder + "\\" + entry.FullName.Replace("wwwroot", name).Replace("/","\\"), true);
+                                    break;
+                            }
+                        }
+                    }
+                    // remove package
+                    File.Delete(packagename);
+                    install = true;
+                }
+            }
+
+            if (install)
+            {
+                // restart application
+                HostApplicationLifetime.StopApplication();
+            }
+        }
+    }
+}