Added clear all settings tile

app/src/main/java/eu/faircode/email/ServiceTileClear.java

@@ -0,0 +1,31 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    FairEmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2022 by Marcel Bokhorst (M66B)
+*/
+
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.service.quicksettings.TileService;
+
+@TargetApi(Build.VERSION_CODES.N)
+public class ServiceTileClear extends TileService {
+    public void onClick() {
+        startActivityAndCollapse(ActivityClear.getIntent(this));
+    }
+}