Upgrade to AndroidX, move to MaterialComponents theme (#953)

* upgrade to AndroidX, upgrade libraries

* move to MaterialComponents theme

* make sure the compose button looks good everywhere

* fix tollbar title/button alignment on tablet

* move to new material color theming, consolidate colors and themes

* fix build, fix imports

* set error on TextInputLayout instead of EditText

* fix imports, TootButton when

* improve snackbar style

* fix task description color

app/src/main/res/menu/search_toolbar.xml

@@ -5,7 +5,7 @@
         android:id="@+id/action_search"
         android:title="@string/action_search"
         android:icon="@android:drawable/ic_menu_search"
-        app:actionViewClass="android.support.v7.widget.SearchView"
+        app:actionViewClass="androidx.appcompat.widget.SearchView"
         android:actionLayout="@layout/search_view"
         app:showAsAction="always" />
 </menu>