Move away from localStorage and use IndexDB

[brunolm]

yarn add idb

• https://github.com/brunolm/gbfr-parser/commit/9f55d8b62b6e34f6bbcd816eb611cadcf4475d7c
• https://github.com/brunolm/gbfr-parser/commit/fe9fa6074fb0d98773fa9c0a629ca5800f6a4ef8

This allows for more than 5MB storage. And it allows the implementation of saving archives, pagination, and other things.