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/Repository/Context/DBContextBase.cs

@@ -22,21 +22,11 @@ namespace Oqtane.Repository
         protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
         {
             optionsBuilder.UseSqlServer(_tenant.DBConnectionString
-                    .Replace("|DataDirectory|", AppDomain.CurrentDomain.GetData("DataDirectory").ToString())
+                    .Replace("|DataDirectory|", AppDomain.CurrentDomain.GetData("DataDirectory")?.ToString())
             );
             base.OnConfiguring(optionsBuilder);
         }
 
-        protected override void OnModelCreating(ModelBuilder modelBuilder)
-        {
-            base.OnModelCreating(modelBuilder);
-
-            if (_tenant.DBSchema != "")
-            {
-                modelBuilder.HasDefaultSchema(_tenant.DBSchema);
-            }
-        }
-
         public override int SaveChanges()
         {
             ChangeTracker.DetectChanges();