Corridor Surface Point Codes

 I've added some code to the https://github.com/C3DReminders/DFWBIUG_C3D_Data_Shortcuts_2020 repository that demonstrates how to get which point codes are being used by a corridor surface. 

This is useful when you want to assign property set information to a corridor feature line when it is extracted from a corridor for use in another program. 

In the code sample, the name of the command is "CorrSurfPointCodes" and it is in the "CorridorFeatureLinesCommand" class.