Forked changes:
Added ability to run shell command inside nnn by : key.
Make bookmark to dir work on only one character like in vim.
Don't confirm on file removal.
Change some keymappings, to be more like vim.
Warning: Text in help page displayed on '?' displays old mappings. New mapping is present in nnn.h
example
:mkdir "new folder"
:cd new folder
Commands other than cd is passed to shell.
cd command's argument should not be in quotes.
