Eagerly load helm

Autoloading helm does not work well with custom keybindings.  Binding our
default "C-c h" to either `helm-command-map' or `helm-command-prefix' gives
errors, as both are not commands.  In the previous configuration, the prefix
"C-c h" was initially undefined and only defined when helm was loaded.  This led
to irritating behavior.

All this can be fixed by eagerly loading helm.  This may slow down startup, in
particular on Windows, but it should be worth it.

init.el

@@ -109,6 +109,7 @@
                   ace-window-display-mode
                   key-chord-mode
                   ivy-mode
+                  helm-mode
                   minions-mode
                   which-key-mode
                   eyebrowse-mode
@@ -1887,7 +1888,7 @@ With given ARG, display files in `db/important-document-path’."
 
 (use-package helm
   :ensure t
-  :commands (helm-show-kill-ring)
+  :defer t
   :diminish helm-mode
   :bind (:map helm-command-map
               ("#" . db/play-radio-stations)
@@ -1918,6 +1919,9 @@ With given ARG, display files in `db/important-document-path’."
             (bind-key "C-i" #'helm-execute-persistent-action helm-map)
             (bind-key "C-z" #'helm-select-action helm-map)))
 
+(use-package helm-ring
+  :commands (helm-show-kill-ring))
+
 (use-package ivy
   :ensure t
   :commands (ivy-mode