Set version to 1.6.0

Made heading icons a customizable variable (emacs-dashboard#135)

Added new init info functionality (emacs-dashboard#126)

Make line moving commands behave like `dired` (emacs-dashboard#117)

- Add `dashboard-previous-line`, `dashboard-next-line`.
- When moving point up or down a line, move to the beginning of that line’s
  item.  This lets us move to some line with `C-n`, then press `RET` to open
  that line’s item immediately.

Give section headings a face for easy visual scanning (emacs-dashboar…

…d#109)

* Remove the "-face" suffix from declarations per elisp docs 39.12.2
* Give section headings a face for easy visual scanning
* Define obsolete face aliases

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New version with registers

Release 1.2.3