lots of important fixes

- DPFS container is fixed
- SD Savegame is fixed
- added slot0x25KeyX load
- added regex for titile ID
- added aes_keys.txt import
- sd savegame listing is fixed (uninitialized won't be listed any more)
- error handling is improved (removed asserts and replaced with return values)
- UI is now functional
- config is now checked in main

src/frontend/import_dialog.ui

@@ -33,7 +33,7 @@
      </column>
      <column>
       <property name="text">
-       <string>Imported</string>
+       <string>Exists</string>
       </property>
      </column>
     </widget>
@@ -66,7 +66,7 @@
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="standardButtons">
-      <set>QDialogButtonBox::Ok|QDialogButtonBox::Cancel</set>
+      <set>QDialogButtonBox::Ok|QDialogButtonBox::Cancel|QDialogButtonBox::Reset</set>
      </property>
     </widget>
    </item>