ui: platform-native GUI library for Go

Feature requests wanted! (Really; IDK what to add next!)

This is a library that aims to provide simple GUI software development in Go. It runs on/requires:

Windows: cgo, MinGW-w64 (see note below), Windows XP and newer
- Note: Notice I specifically said MinGW-w64 here. This is important: regular MinGW is missing various recent header files which package ui uses, and thus won't build with it. Make sure your MinGW is that version instead. If you're running on Windows and are not sure what to download, get the mingw-builds distribution.
Mac OS X: cgo, Mac OS X 10.7 and newer
other Unixes: cgo, GTK+ 3.4 and newer

Go 1.3 is required. Note that vanilla 1.3 has a bug in Mac OS X cgo; the next release will fix it.

(this README needs some work)

Be sure to have at least each outermost Window escaping to the heap until a good resolution to Go issue 8310 comes out.

prevlib.tar contains the previous version of the library as it stood when I restarted; don't bother using it.

The in-code documentation needs improvement. I have written a tutorial in the Wiki.

3 September 2014
The new GtkGrid-style Grid is now implemented! See its documentation for more details. Also, debugging spew has been removed.

31 August 2014
Grid is now renamed SimpleGrid in preparation for implementing a more GtkGrid-like Grid. Mind the change.

The example widget gallery on GTK+ in the Adwaita theme (3.13/master):