* Add option parsing to `prompt_fresh_setup` to detect when options are
set during setup.
* Add `-a` option to enable almostontop behaviour, every time a command
is invoked the screen is cleared and the is prompt redrawn before the
command begins using the `preexec` hook. `-a` is disabled by default.
* Add `prompt_fresh_help` function to display a description of available
options using `prompt -h fresh`.
* Canonicalize all utility functions for the fresh prompt theme to
follow the `fresh_<name>` convention.
Fixes#1.
Depends on setting the following in `.tmux.conf`:
set -ga terminal-overrides '*:Ss=\E]1337;CursorShape=%p1%d\7'
This allows changing the iTerm2 cursor shape using the same escape
sequences as used for VTE compatible terminals.
Sending escape sequences directly from zsh and bypassing tmux results in
the wrong cursor shape when switching between panes which no longer
reflect the current zsh vi mode.
When using ZTE compatible terminals tmux supports tracking cursor shape
changes on a per pane basis using a suitable `terminal-override`, this
allows zsh and vim to behave as if they are not operating in tmux and
everything works as expected. However, so far I've not been able to
reproduce this behaviour in iTerm2.
