inline-edit: move action mode menu handling int activity

OpenKeychain/src/main/res/layout/edit_icon.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:layout_centerInParent="true"
+    android:padding="0dp"
+    android:src="@drawable/ic_mode_edit_white_24dp"
+    style="@style/Widget.AppCompat.ActionButton" />

OpenKeychain/src/main/res/menu/action_mode_edit.xml

@@ -3,9 +3,9 @@
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
     <item
-        android:id="@+id/menu_edit_user_ids"
+        android:id="@+id/menu_action_mode_edit"
         android:icon="@drawable/ic_mode_edit_white_24dp"
-        android:title="@string/key_view_action_edit_ids"
+        android:title="@string/key_view_action_edit"
         app:showAsAction="always"
         />
 

OpenKeychain/src/main/res/menu/edit_subkeys.xml

@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
-
-    <item
-        android:id="@+id/menu_edit_subkeys"
-        android:icon="@drawable/ic_mode_edit_white_24dp"
-        android:title="@string/key_view_action_edit_subkeys"
-        app:showAsAction="always"
-        />
-
-</menu>

OpenKeychain/src/main/res/values/strings.xml

@@ -666,8 +666,7 @@
     <string name="key_list_fab_import">"Import from File"</string>
 
     <!-- Key view -->
-    <string name="key_view_action_edit_ids">"Edit Identities"</string>
-    <string name="key_view_action_edit_subkeys">"Edit Subkeys"</string>
+    <string name="key_view_action_edit">"Edit"</string>
     <string name="key_view_action_encrypt">"Encrypt text"</string>
     <string name="key_view_action_encrypt_files">"files"</string>
     <string name="key_view_action_certify">"Confirm key"</string>