Fix more bugs, move plugins.edn and add enabled

- Move plugins.edn to config/ as it is user configuration
- Add plugin-config enabled flag and moved plugin enabled
- Fixed bugs with manual install
- Refactored plugin-config component to have its own listener
- Split out shared plugin fns to a common ns - plugin-config shouldn't
  need to depend on a component like plugin-handler
- Bump rewrite-edn to include upstream fix and avoid tons of cljs
  warnings with earlier versions
- Fix react warning introduced outside this PR in ui/icon

src/main/frontend/components/settings.cljs

@@ -726,7 +726,7 @@
   (let [current-repo (state/sub :git/current-repo)
         ;; enable-block-timestamps? (state/enable-block-timestamps?)
         _installed-plugins (state/sub :plugin/installed-plugins)
-        plugins-of-settings (and plugin-handler/lsp-enabled? (seq (plugin-handler/get-enabled-plugins-if-setting-schema)))
+        plugins-of-settings (and config/lsp-enabled? (seq (plugin-handler/get-enabled-plugins-if-setting-schema)))
         *active (::active state)]
 
     [:div#settings.cp__settings-main