Closes #3754

tutor: Update vim-tutor to 0.2.1

Also, some tweaks based on input by @fdinoff on gitter.

Note: it looks like viminfo files do not store search direction intentionally.
After reading viminfo file search direction was considered to be “forward”.

Note 2: all files created on earlier Neovim version will automatically receive
“forward” direction.

Fixes #3580

Add plugin for editing ShaDa files

Do not use `finish` inside of `provider#python{,3}#Call`, but `return`.

Contains most of the logic

Closes #3535

Update runtime files.

https://github.com/vim/vim/commit/8feef4ff6253afb9dcc61c40082ed4fbb96b685c