pre-libui

This build is available for those who still want to use a working package ui while libui is being completed. Keep in mind:

• it is buggy (redraw issues on Windows, for instance)
• it is not guaranteed to be stable (Go pointer shenanigans may interfere; make sure at least Windows exist on the heap!)
• its API is very different from the final package ui API
• it is no longer supported

This is a tag instead of the master branch because it's already too late to branch, at least with my current knowledge of git :/

That being said, enjoy, I guess