Add support emails

app/src/amazon/res/values/keys.xml

@@ -4,4 +4,5 @@
   <string name="market_url">amzn://apps/android?p=org.tasks</string>
   <string name="p_purchases">purchases_amazon</string>
   <string name="manage_subscription_url">https://www.amazon.com/gp/mas/your-account/myapps/yoursubscriptions/ref=d2_ss_app_sb_myas</string>
+  <string name="support_email">amazon-support@tasks.org</string>
 </resources>

app/src/generic/res/values/keys.xml

@@ -5,4 +5,5 @@
   <string name="p_purchases">purchases_fdroid</string>
   <!--suppress CheckTagEmptyBody -->
   <string name="manage_subscription_url"></string>
+  <string name="support_email">support@tasks.org</string>
 </resources>

app/src/googleplay/res/values/keys.xml

@@ -5,4 +5,5 @@
   <string name="market_url">market://details?id=org.tasks</string>
   <string name="p_purchases">purchases</string>
   <string name="manage_subscription_url">https://play.google.com/store/account/subscriptions?sku=annual_499&amp;package=org.tasks</string>
+  <string name="support_email">play-support@tasks.org</string>
 </resources>

app/src/main/java/org/tasks/injection/InjectingPreferenceActivity.java

@@ -138,12 +138,13 @@ public abstract class InjectingPreferenceActivity extends AppCompatPreferenceAct
 
   @Override
   public boolean onMenuItemClick(MenuItem item) {
+    String email = getString(R.string.support_email);
     switch (item.getItemId()) {
       case R.id.menu_contact:
         Intent mailto =
             new Intent(
                 Intent.ACTION_SENDTO,
-                Uri.fromParts("mailto", "Tasks Support <support@tasks.org>", null));
+                Uri.fromParts("mailto", "Alex <" + email + ">", null));
         mailto.putExtra(Intent.EXTRA_SUBJECT, "Tasks Feedback");
         mailto.putExtra(Intent.EXTRA_TEXT, device.getDebugInfo());
         startActivity(mailto);