Refactor Repository #59
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Structure:
DataManagercontainsdb: Connection?, which is the main (only) database handle.DataManagerprovides functions to open a database, create a new database, create a sample database.Views access the database through
@EnvironmentObject dataManager.dataManager.repositoryreturns aRepository?, which represents the whole database and encapsulates a few details of database access.dataManager.<T>Repositoryreturns a<T>Repository?, which represents table<T>and encapsulates the database access to a single table.Repositoryand<T>Repositorycontaindb: Connection, which is not optional. For convenience, there are initializers for an optionaldb, which returnRepository?and<T>Repository?.