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/layout/item_status_placeholder.xml

@@ -6,11 +6,10 @@
 
     <Button
         android:id="@+id/button_load_more"
-        style="@style/Widget.AppCompat.Button.Borderless"
+        style="@style/TuskyButton.TextButton"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:text="@string/load_more_placeholder_text"
-        android:textColor="?attr/colorAccent"
         android:textSize="?attr/status_text_medium" />
 
     <ProgressBar