editors/sciteco: Add new port

SciTECO is an interactive TECO dialect, similar to Video TECO.
It also adds features from classic Standard TECO-11,
and incorporates many unique new ideas.
It is geared towards UNIX-like operating systems but also
natively supports Microsoft Windows NT.

PR: 276492
Reported by: Robin Haberkorn <robin.haberkorn@googlemail.com> (maintainer)