#1578 Environment Settings: Console programs update

[surrim]

I refer to the "Terminal to launch console programs" selection list in the Environment Settings.

1. Please add /usr/bin/cosmic-term --

2. Please use gnome-terminal --wait -t $TITLE -- (not "-x", not "-e")

$ gnome-terminal -x echo
Option “-x” is deprecated and might be removed in a later version of gnome-terminal.
Use “-- ” to terminate the options and put the command line to execute after it.

3. Please remove whitespaces from the end of some entries

Thanks a lot :)