This adds migrations and data migrations for the awakening update.
* A new `Awakenings` table now exists that stores all possible awakenings, with a column for object type.
* GridCharacter and GridWeapon now have `awakening_id` and `awakening_level` fields. Their `awakening` and `awakening_type` fields were removed.
* Weapons have a mapping table, `WeaponAwakenings`, as not all weapons can be awakened.
* Data migrations are included to migrate existing user data. They should be run automatically when the migration is run with `rails db:migrate:with_data`
