Create a new clients/ subdirectory at the top level, and move cli/ and
tui/ into it, as well as nm-online.c (which was previously in test/,
which made no sense).
cli/ was split into two subdirectories, src/ and completion/. While
this does simplify things (given that the completion file and the
binary both need to be named "nmcli"), it bloats the source tree, and
we can work around it by just renaming the completion file at install
time. Then we can combine the two directories into one and just have
it all under clients/cli/.
Remove all remaining GParamSpec name and blurb strings (and fix
indentation while we're there), and add G_PARAM_STATIC_STRINGS to all
paramspecs that were lacking it.
nmt_newt_listbox_clear() did not reset active and active_key, which in
the case of NmtEditConnectionList meant that after the connection list
was rebuilt, the selection would appear to be in the same place, but
active_key would still point to the connection that used to be in that
row, rather than the one currently in that row, so if you immediately
hit Edit or Delete, you'd get unexpected results. (It also meant that
it was possible for the selection to land on a header row instead of a
connection row.)
This was particularly bad in the case of the Delete button, since
active_key would be left pointing to a freed NMConnection in that
case.
Fix NmtNewtListbox, and then add code to NmtEditConnectionList to
preserve the selection itself when rebuilding the list.
