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* Make steef much faster by not printing all history each time

* Use whence -c to expand shell functions as well

* Use $2 (expanded command about to be ran)

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

steeef theme sets colors depending on $TERM, however if %F is
used, it must be closed by %f instead of %{$reset_color%}.

Further on, all %f directives have been replaced by %F and color
support of current TERM is checked more properly.

This stops the virtual env name from being printed before it is actually being
used in the zsh prompt.