#77 `security` module
#77 Copied the confidential store structure from Jenkins
#77 Using the encryption key
#77 Moved the encryption service to the `service` module
#77 Moved the Ontrack configuration bean back to the services
#77 Correction of unit tests for changing the password
#77 Adding integration tests for changing the password
#77 Null strings do not need to be encrypted
#77 Integration test for the migration
#77 Makes sure DBInit runs with autoCommit = false