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vi is very old-school. Nano is somewhat easier. I use it with SSH to edit files on another pc. The Linuxcnc includes geany  which is a GUI based text editor

I can't see why the new planner can't be put in its own folder under /src/emc together with its build system. Surely linuxcnc's make system can call another build environment. In fact some of the lcnc code is written in c++   

Have a look at the header files in src/emc/rs274ngc. Classs don't exist in C  

hakan is on the right track
There are a couple of xml files here with configs for Rtelligent and Deiwu I.O modules created exactly how endian menrions
github.com/rodw-au/linuxcnc-cia402

 If you get a USB wifi dongle with an external antenna you can get a SMA extension cable with a bulkhead connector on the end. Drill hole through enclosure, insert fitting and attach with supplied nut, and attach the antenna from the dongle. I have done this a few times now.

small update moving forward with this.