Problem: the vimtutor can be improved
Solution: port and include the interactive vimtutor plugin from Neovim
(by Felipe Morales) (Yegappan Lakshmanan)
closes: #6414
Signed-off-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
