JobScheduler Setup should work with MySQL 8

Current Situation

When installing JobScheduler Master with MySQL 8 an error occurs when creating the database tables.

The SQL script daily_plan.sql and jadehistory.sql fails with the message
Error Code: 1071. Specified key was too long; max key length is 3072 bytes
The reason is the length of the unique constraint fields that is bigger than 3072 bytes.

Desired Behavior

It should be possible to install JobScheduler Master with MySQL 8.

Maintainer note

The file jadehistory.sql will no longer be part of the db folder.