Manager classes added and model updates

This commit introduces a large number of changes. Namely there are a
number of additions to a new set of classes that manage the database
and/ or the models shared between the code and databse. There is
fragmented non-functional code in this commit and there may be debug/
old code that still needs to be removed. This commit is just to version
these changes as they were not commited previously. There is also some
console interface code written, but has next to no functionality
attached to any existing prompts. More details will be published per .cs
file, ie specific manager or model, once they are finished as they are
undergoing rapid and significant changes regularly.

OpheliasOasis/Managers/TxTableManager.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Ophelias.Managers;
+using Ophelias.Models;
+using System.Data.SQLite;
+
+namespace Ophelias.Managers
+{
+    internal class TransactionTableManager
+    {
+        DatabaseManager dbManager;
+        SQLiteCommand? cur;
+        internal TransactionTableManager(DatabaseManager manager)
+        {
+            dbManager = manager;
+            cur = manager.cur;
+        }
+    }
+}