testing/{tcl-readline,tk-lib,tke}: new aports

tcl-readline adds readline support to Tcl. This can be loaded into tclsh, to enable it to support command tab completion, interactive line editing, and history.

tk-lib is the Tk standard library, containing widgets and helper functions for Tk. It complements the Tcl standard library (testing/tcl-lib).

tke is a graphical text editor written in Tcl/Tk. It utilizes tk-lib, and provides features such as syntax highlighting, multi-cursor/selection support, diff viewer, plugin, themes, and much more.