[vim] Allow Funcref in g:fzf_action

https://github.com/junegunn/fzf.vim/issues/185

README-VIM.md

@@ -55,6 +55,19 @@ let g:fzf_action = {
   \ 'ctrl-x': 'split',
   \ 'ctrl-v': 'vsplit' }
 
+" An action can be a reference to a function that processes selected lines
+function! s:build_quickfix_list(lines)
+  call setqflist(map(copy(a:lines), '{ "filename": v:val }'))
+  copen
+  cc
+endfunction
+
+let g:fzf_action = {
+  \ 'ctrl-q': function('s:build_quickfix_list'),
+  \ 'ctrl-t': 'tab split',
+  \ 'ctrl-x': 'split',
+  \ 'ctrl-v': 'vsplit' }
+
 " Default fzf layout
 " - down / up / left / right
 let g:fzf_layout = { 'down': '~40%' }