This implements `CoreKeyboardInterface.loadSerializedOptions` by getting
the list of all variable store names from Core and then trying to load
these.
Also change `VariableStoreSerializer.loadStore` signature so that it can
return `undefined`. This allows to return only those options from
`loadSerializedOptions` that have a non-default value, i.e. were
serialized before.
Build-bot: skip build:web
Test-bot: skip
Keyman makes it possible for you to type in any language
on Windows, macOS, Linux, iPhone, iPad, Android tablets and phones, and even
instantly in your web browser. Create keyboard layouts with Keyman Developer and
share them with the community in the keyboards
repository. The Keyman
Community have so far contributed
well over 1,000 keyboard layouts for over 2,500 languages!
License
Copyright (c) SIL Global.
Keyman is an open source project distributed under the MIT license.