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.Shared/Models/Tenant.cs

@@ -7,9 +7,7 @@ namespace Oqtane.Models
         public int TenantId { get; set; }
         public string Name { get; set; }
         public string DBConnectionString { get; set; }
-        public string DBSchema { get; set; }
         public bool IsInitialized { get; set; }
-
         public string CreatedBy { get; set; }
         public DateTime CreatedOn { get; set; }
         public string ModifiedBy { get; set; }