💥 Refactor add-hook! macro & change arg order

This update may potentially break your usage of add-hook! if you pass
the :local or :append properties to it. This is how they used to work:

  (add-hook! :append 'some-mode-hook #'do-something)

Thsoe properties must now follow the hooks, e.g.

  (add-hook! 'some-mode-hook :append #'do-something)

Other changes:
- Various add-hook calls have been renamed to add-hook! because I
  incorrectly assumed `defun` always returned its definition's symbol,
  when in fact, its return value is "undefined" (so sayeth the
  documentation). This should fix #1597.
- This update adds the ability to add multiple functions to hooks
  without a list:

    (add-hook! 'some-mode-hook
               #'do-something
               #'do-something-else)

- The indentation logic has been changed so that consecutive function
  symbols at indented at the same level as the first argument, but forms
  are indent like a defun.

    (add-hook! 'some-mode-hook
               #'do-something
               #'do-something-else)

    (add-hook! 'some-mode-hook
      (message "Hello"))

modules/tools/lsp/config.el

@@ -25,7 +25,7 @@
 (use-package! lsp-ui
   :hook (lsp-mode . lsp-ui-mode)
   :init
-  (add-hook 'lsp-ui-mode-hook
+  (add-hook! 'lsp-ui-mode-hook
     (defun +lsp-init-ui-flycheck-or-flymake-h ()
       "Sets up flymake-mode or flycheck-mode, depending on `lsp-prefer-flymake'."
       (unless (eq :none lsp-prefer-flymake)
@@ -61,7 +61,7 @@
   :init
   ;; Make sure that `company-capf' is disabled since it is incompatible with
   ;; `company-lsp' (see lsp-mode#884)
-  (add-hook 'lsp-mode-hook
+  (add-hook! 'lsp-mode-hook
     (defun +lsp-init-company-h ()
       (if (not (bound-and-true-p company-mode))
           (add-hook 'company-mode-hook #'+lsp-init-company-h t t)