Changed all @nullable to Nullable.

Author: Steve Ives

HarmonyCoreExtensions/ParameterBridgeType.dbl

@@ -121,7 +121,7 @@ namespace HarmonyCoreExtensions
                     (CoerceType.Boolean),
                         result = "boolean"
                     (CoerceType.DateTime),
-                        result = "@DateTime"
+                        result = "DateTime"
                     (CoerceType.DateTimeNullable),
                         result = "Nullable<Datetime>"
                     (CoerceType.Decimal),

HarmonyCoreExtensions/ReturnValueBridgeType.dbl

@@ -122,13 +122,13 @@ namespace HarmonyCoreExtensions
                     (CoerceType.Boolean),
                         mreturn "boolean"
                     (CoerceType.DateTime),
-                        mreturn "@DateTime"
+                        mreturn "DateTime"
                     (CoerceType.DateTimeNullable),
-                        mreturn "@Nullable<Datetime>"
+                        mreturn "Nullable<Datetime>"
                     (CoerceType.Decimal),
                         mreturn "decimal"
                     (CoerceType.DecimalNullable),
-                        mreturn "@Nullable<decimal>"
+                        mreturn "Nullable<decimal>"
                     endusing
                 end
                 (ReturnType.ImpliedDecimal),