[Starkit] Adding encodings to Tclkit

[Jean-Claude Wippler]

FYI, there's a new documentation page on how to add more Unicode 
encodings to Tclkit (or any variant thereof):
	http://www.equi4.com/tkunicode.html

I thought about adding that as a new feature in SDX, but it would have 
increased its size by some 400 Kb, which is too much bloat for people 
who just use SDX to wrap and unwrap kits and packs.

It should in fact be quite simple to create a separate starkit which 
carries all the encoding files with it and modifies a tclkit binary in 
place (not the one running) by mounting, copying, unmounting.

Note the use of the new "sdx mksplit" command to easily dissect and 
re-assemble starpacks.

-jcw