vim: add bzl and proto folding

vimrc

@@ -94,6 +94,8 @@ autocmd FileType man set nomod nolist readonly
 autocmd FileType man map q :q<CR>
 autocmd FileType diff map H zA
 autocmd FileType diff map L za
+autocmd FileType bzl set foldmethod=indent foldnestmax=3 foldlevel=2
+autocmd FileType proto set foldmethod=syntax
 
 autocmd InsertEnter * if !exists('w:last_fdm') | let w:last_fdm=&foldmethod | setlocal foldmethod=manual | endif
 autocmd InsertLeave,WinLeave * if exists('w:last_fdm') | let &l:foldmethod=w:last_fdm | unlet w:last_fdm | endif