nvim: Switch to better-whitespace

Might be better as it is faster for the common case. See comment,
https://github.com/axelf4/vim-strip-trailing-whitespace/issues/2#issuecomment-573422150

nvim/.config/nvim/init.vim

@@ -9,7 +9,7 @@ Plug 'PeterRincker/vim-searchlight'
 Plug 'wincent/ferret'
 Plug 'lambdalisue/reword.vim'
 " Remove extraneous whitespace when edit mode is exited
-Plug 'axelf4/vim-strip-trailing-whitespace'
+Plug 'ntpeters/vim-better-whitespace'
 " Manage Project sessions
 Plug 'thaerkh/vim-workspace'
 " For autocompletion

nvim/.config/nvim/plugin_settings.vim

@@ -1,3 +1,8 @@
+" Better whitespace
+let g:better_whitespace_enabled = 1
+let g:strip_whitespace_on_save = 1
+let g:better_whitespace_operator = ''
+let g:strip_whitespace_confirm = 0
 " Automatically detect style file and apply style to formatting
 let g:clang_format#detect_style_file = 1
 " For workspace