Moving away from QT to a native Go GUI

[DaleFarnsworth]

One of the challenges in developing editcp is that when it was begun there was no reasonably-featured native Go GUI library. I ended up using therecipe's Go interface to the C++ QT library. While this works, it is problematic. It ends up taking minutes to compile rather than the normal Go compile times of seconds. Also when a bug was triggered in the C++ code, it was sometimes difficult to determine the cause of the bug.

This is a heads up to anyone developing with this code. I have begun replacing QT with the Goki Graphical Interface system (https://github.com/goki/gi). I don't know how long it will take or whether it will be practical, but I'll give it a try.