Improvements for dark mode (#322)

* Action colors are now determined based on theme

* Fix unused import

* Update some more colors based on theme

* Updated release notes

* Better color choice

* Update for home screen

* Updates for app drawer

* remove unused import

lib/widget/search.dart

@@ -358,7 +358,7 @@ class _SearchDisplayState extends RefreshableState<SearchWidget> {
         trailing: GestureDetector(
           child: FaIcon(
             searchController.text.isEmpty ? FontAwesomeIcons.magnifyingGlass : FontAwesomeIcons.deleteLeft,
-            color: searchController.text.isEmpty ? COLOR_CLICK : COLOR_DANGER,
+            color: searchController.text.isEmpty ? COLOR_ACTION : COLOR_DANGER,
           ),
           onTap: () {
             searchController.clear();