Add shell/zsh-navigation-tools.

Set of Zsh tools with features like incremental multi-word searching,
approximate matching, ANSI coloring, themes, unique mode, horizontal
scroll and advanced history management. Selected tools provided:

• n-history - full-screen history searcher and manager
• n-kill - browses process list, allows quick searching and sending signal to selected process
• n-panelize - loads output of given command for browsing and multi-word searching
• n-cd - browses dirstack and bookmarked directories, allows to enter selected directory
• n-functions - browses functions, relegates editing to vared

Written in pure Zsh, with use of curses module. Can be configured from
zshrc. Binds n-history to Ctrl-R. Provides widgets for n-cd and n-kill.

WWW: https://github.com/psprint/zsh-navigation-tools

PR: 209263
Submitted by: Sebastian Gniazdowski