Some major updates including heuristics

- Allow to define heuristics in heuristics.yaml
- Migrate all filetypes from vim beginning with "a"
- Remove enhanced cpp syntax (it was too slow to load)
- Use setf instead of set ft for setting filetype (faster)
- Override native hauristics with au!
- Add globbing of files for packages
- Replace predefined dirs with extra_dirs and ignored_dirs
- Allow to define proper order of packages with topological sort
- Fix powershell detection
- Lint and fix many packages.yaml issues
- etc etd

autoload/go/config.vim

@@ -55,6 +55,10 @@ function! go#config#TermCloseOnExit() abort
   return get(g:, 'go_term_close_on_exit', 1)
 endfunction
 
+function! go#config#TermReuse() abort
+  return get(g:, 'go_term_reuse', 0)
+endfunction
+
 function! go#config#SetTermCloseOnExit(value) abort
   let g:go_term_close_on_exit = a:value
 endfunction