Prepare for termbox/windows build

src/Makefile

src/README.md

src/ansi.go

src/ansi_test.go

src/constants.go

src/constants_unix.go

src/constants_windows.go

src/options.go

src/options_test.go

src/result.go

src/result_test.go

src/terminal.go

src/terminal_unix.go

src/terminal_windows.go

src/tui/ncurses.go

src/tui/termbox.go

src/tui/tui.go

src/tui/tui_test.go

src/util/util.go

src/util/util_unix.go