#817 Move code for toggling ALE to its own file

test/test_autocmd_commands.vader

@@ -1,6 +1,7 @@
 Before:
   function! CheckAutocmd(group)
-    call ALEInitAuGroups()
+    call ale#toggle#InitAuGroups()
+
     redir => l:output
       execute 'silent! autocmd ' . a:group
     redir END
@@ -58,7 +59,7 @@ After:
     call ale#completion#Disable()
   endif
 
-  call ALEInitAuGroups()
+  call ale#toggle#InitAuGroups()
 
 Execute (g:ale_lint_on_text_changed = 0 should bind no events):
   let g:ale_lint_on_text_changed = 0