[vim] Add a few plugins

- CtrlSF for project-wide find and replace
- vim-visual-increment allows numbering a visually-selected column
  incrementally
- vim-visual-multi gives multiple cursors at once allowing for easy
  refactors of certain kinds

editors/vim/vimrc

@@ -181,6 +181,14 @@ let g:airline#extensions#tabline#enabled = 1
 let g:airline#extensions#tabline#left_sep = ' '
 let g:airline#extensions#tabline#left_alt_sep = '|'
 
+" ^A / ^Z on a column of numbers will increment them in ascending order
+" (i.e. a bullett list)
+Plug 'triglav/vim-visual-increment'
+
+Plug 'dyng/ctrlsf.vim'
+
+Plug 'mg979/vim-visual-multi'
+
 call plug#end()
 hi Normal ctermbg=none