Add rename and tree modifiers, binding function purpose enum

StructureHelperCommon/Models/Functions/FormulaFunction.cs

@@ -95,6 +95,7 @@ namespace StructureHelperCommon.Models.Functions
             formulaFunction.Step = Step;
             formulaFunction.MinArg = MinArg;
             formulaFunction.MaxArg = MaxArg;
+            formulaFunction.FunctionPurpose = FunctionPurpose;
             return formulaFunction;
         }
 

StructureHelperCommon/Models/Functions/TableFunction.cs

@@ -68,6 +68,7 @@ namespace StructureHelperCommon.Models.Functions
             tableFunction.Table = newTable;
             tableFunction.IsUser = true;
             tableFunction.Group = GROUP_TYPE_2;
+            tableFunction.FunctionPurpose = FunctionPurpose;
             return tableFunction;
         }