Begun integration of models and managers

The HotelManager class now has been connected to some aspects of the
command line interface and is functioning for a few cases such as
logging in as a specific guest via email, chaging a guests information
and creating a new guest account. This was implemented first over the
reservation system to test and implement something on a smaller scale.
Furthermore, the reservation depends on an existing guest account since
a Guest ID needs to be linked to the reservation that is created.
Other changes include redesigning, tweaking/ adjusting, and/ or fixing
of other modules that have not yet been implemented or are partially
implemented.

OpheliasOasis/Models/Guest.cs

@@ -17,14 +17,9 @@ namespace Ophelias.Models
         internal string? CCV;
         internal string? Expiration;
 
-        internal Guest(string FirstName, string LastName, string Email)
-        {
-            this.FirstName = FirstName;
-            this.LastName = LastName;
-            this.Email = Email;
-        }
-        internal Guest(string FirstName, string LastName, string Email, string CreditCard, string Expiration, string CCV)
+        internal Guest(int Id, string FirstName, string LastName, string Email, string? CreditCard = null, string? Expiration = null, string? CCV = null)
         {
+            this.Id = Id;
             this.FirstName = FirstName;
             this.LastName = LastName;
             this.Email = Email;