Add xml comments and DateTime datatype support for SQL

TShockAPI/DB/SqlColumn.cs

@@ -28,11 +28,30 @@ namespace TShockAPI.DB
 
 
 		//Optional
+		/// <summary>
+		/// Sets/Gets if it's unique 
+		/// </summary>
 		public bool Unique { get; set; }
+		/// <summary>
+		/// Sets/Gets if it's primary key
+		/// </summary>
 		public bool Primary { get; set; }
+		/// <summary>
+		/// Sets/Gets if it autoincrements
+		/// </summary>
 		public bool AutoIncrement { get; set; }
+		/// <summary>
+		/// Sets/Gets if it can be or not null
+		/// </summary>
 		public bool NotNull { get; set; }
+		/// <summary>
+		/// Sets the default value
+		/// </summary>
 		public string DefaultValue { get; set; }
+		/// <summary>
+		/// Use on DateTime only, if true, sets the default value to the current date when creating the row.
+		/// </summary>
+		public bool DefaultCurrentTimestamp { get; set; }
 
 		/// <summary>
 		/// Length of the data type, null = default
@@ -51,4 +70,4 @@ namespace TShockAPI.DB
 			Length = length;
 		}
 	}
-}
+}