Do not use ImportKeysListFragment for Security Token import, fixes #1959. Also introduces radio button to import key information from file

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

@@ -82,6 +82,13 @@
                         android:layout_marginTop="16dp"
                         android:text="@string/security_token_import_radio" />
 
+                    <RadioButton
+                        android:id="@+id/token_decision_file"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="16dp"
+                        android:text="@string/security_token_file_radio" />
+
                     <RadioButton
                         android:id="@+id/token_decision_reset"
                         android:layout_width="match_parent"
@@ -117,6 +124,7 @@
                     android:textAppearance="?android:attr/textAppearanceMedium"
                     android:textColor="@color/android_red_dark"
                     android:visibility="gone" />
+
             </FrameLayout>
 
         </RelativeLayout>