File manager nnn v2.5 released with many plugins, mouse support, sshfs and more

`nnn` is a lean and fast file manager, disk usage analyzer, fuzzy app launcher and batch file renamer.

Homepage: https://github.com/jarun/nnn

### New in v2.5

  - [plugin](https://github.com/jarun/nnn/tree/master/plugins) support. 19 plugins added. Some are:
    - pdfview: view a PDF in pager
    - nmount: (un)mount a storage device
    - ndiff: file and directory diff for selection
    - hexview: view a file in hex
    - imgresize: batch resize images to desktop resolution
    - ipinfo: check your IP address and whois information
    - transfer: upload a file to transfer.in
    - pastebin: paste the contents of a text file to paste.ubuntu.com
    - boom: play random music from a directory
    - nwal: set an image as wallpaper using nitrogen
    - pywal: set selected image as wallpaper, change terminal color scheme
    - getplugs: update plugins
  - SSHFS support
  - support `bsdtar`, simplify `patool` integration
  - native batch rename support (`vidir` dependency dropped)
  - mouse support
  - new location for config files - `~/.config/nnn`
    - plugin dir location: `~/.config/nnn/plugins`
    - selection file `.nnncp` is now `~/.config/nnn/.selection`
  - support [configuration](https://github.com/jarun/nnn/wiki/nnn-as-default-file-manager) as the default file manager
  - per-context detail/light mode
  - case-insensitive version compare
  - shortcut to visit `/` - <kbd>`</kbd> (backtick)
  - vim-like scrolloff support
  - `^D` & `^U`: scroll half page, `PgDn` & `PdUp`: scroll full page
  - fix selection across contexts
  - recognize `Home` and `End` keys at prompt for editing
  - fix broken program option `-b`
  - POSIX-compliant user-scripts (wherever possible)
  - `NNN_SCRIPT` is retired (replaced by plugins)