IF update - 8: logical interface update

Added #new #indexing scheme for #interface #entries in IF module. The #interface #create / #remove routines has been upgraded for latest changes accordingly. These changes will cause interface entries to be represented as closely as needed by the standard/custom functionality and reduces the augmentation that comes in between.

#IF update 8 ...
[commit ae6234001b7e805cd6042e1589096d0765230431] (https://github.com/nes-repo/NES-Open-Switch/commit/ae6234001b7e805cd6042e1589096d0765230431)