top: apply a special emphasis with some focus elements

top: apply a special emphasis with some focus elements

Since top now uses string vectors for two items in the
new focus window (cmdline & environ), there is no real
use for that 'separator' specified at toggle time. So,
this commit will find a new use for what is the space.

Henceforth, when a user is navigating using the tab or
backtab keys, should a strv element with focus contain
embedded space(s), it will be emphasized & highlighted
using the current window's message color (capclr_msg).

Signed-off-by: Jim Warner <james.warner@comcast.net>