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.Client/Modules/Admin/Sites/Add.razor

@@ -164,7 +164,7 @@ else
             _tenantid = (string)e.Value;
             if (_tenantid != "-1")
             {
-                Tenant tenant = _tenants.Where(item => item.TenantId == int.Parse(_tenantid)).FirstOrDefault();
+                Tenant tenant = _tenants.FirstOrDefault(item => item.TenantId == int.Parse(_tenantid));
                 if (tenant != null)
                 {
                     _isinitialized = tenant.IsInitialized;
@@ -273,8 +273,11 @@ else
                         if (user != null)
                         {
                             Tenant tenant = _tenants.FirstOrDefault(item => item.TenantId == int.Parse(_tenantid));
-                            tenant.IsInitialized = true;
-                            await TenantService.UpdateTenantAsync(tenant);
+                            if (tenant != null)
+                            {
+                                tenant.IsInitialized = true;
+                                await TenantService.UpdateTenantAsync(tenant);
+                            }
                         }
                     }
                     await Log(aliases[0], LogLevel.Information, "", null, "Site Created {Site}", site);