Introduce xengineering.eu/ceres/model/migrations

This new package is only for database migrations. All data for Ceres
should be stored inside the SQLite3 database. Thus migrations can always
be executed with functions with the following signature.

    func(tx *sql.Tx) error

Those migration functions should be stored inside the new package.
Bigger SQL code can be stored in *.sql files for better syntax
highlighting. This code is embedded into the final Go executable by
using the embed package.

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