Misc syntax fixes; show phrases now settable opt

There were a number of syntax fixes needed and done. The
showPhrases setting was in Transform.lsl - with the ability to
set externally - but nothing set it. Added menu option for
showPhrases, as well as Preferences option for startup.
Finished showPhrases option; con to ondemand lstnr

Finished implementing the "showPhrases" option in the Feature...
menu - only to realize is in the Type... menu - but "mistake"
in looking in the "wrong" place happens to others, surely, so
leaving it in. Main.lsl changed to create an on-demand listener,
using llListenControl.