Database Manager

done:
+ master.sql as resource
+ implemented incremental database changes also for Master
+ dbUp sql script variables implemented
+ improved database handling and creation code
+ simpified database creation
+ almost all Database and Tenant creation moved to DatabaseManager.cs (rest code marked with TODO)
+ Unattended install of master can be performed by settings in appsettings.json
+ Improved IsInstalled checking
+ Removed DBSchema field from Tenant
+ Default database and site creation moved to Program.Main

Oqtane.Server/Program.cs

@@ -4,6 +4,8 @@ using Microsoft.Extensions.Hosting;
 using Microsoft.AspNetCore.Blazor.Hosting;
 using Microsoft.Extensions.Configuration;
 using Microsoft.AspNetCore;
+using Microsoft.Extensions.DependencyInjection;
+using Oqtane.Infrastructure;
 
 namespace Oqtane.Server
 {
@@ -12,7 +14,14 @@ namespace Oqtane.Server
 #if DEBUG || RELEASE
         public static void Main(string[] args)
         {
-            CreateHostBuilder(args).Build().Run();
+            var host = CreateHostBuilder(args).Build();
+            using (var serviceScope = host.Services.GetRequiredService<IServiceScopeFactory>().CreateScope())
+            {
+                var manager = serviceScope.ServiceProvider.GetService<DatabaseManager>();
+                manager.StartupMigration();
+            }
+            //DatabaseManager.StartupMigration();                    
+            host.Run();
         }
 
         public static IHostBuilder CreateHostBuilder(string[] args) =>