v5 - API changes and Performance fixes

• consolidate all Hubs into one to have only one connection active
• add several database migrations to adjust the database (MAKE BACKUPS)
• add limits for strings in database entries for better performance
• split up auth into its own table for better performance
• add more relevant indexes
• no loss of data is expected
• API increase to 5

v4 - API change to Authentication

• Changes handling of Authentication
• Performance improvements

v3 HF1 - API Version on empty connection

Now returns API Version on empty connection

v3 - Adds SystemInfoAPI

This release adds the following features:

• new API call to get SystemInfo of current service (CPU, RAM, Cache Usage, Files in Cache, Users online, Network in, Network out)
• API level increased to 3

v2 - breaking API changes

• API calls are now unified between Client and Server and don't rely on strings

v1 HF1 - Hotfix to FileCleanupService

This release fixes following issues:

• FileCleanupService does not delete files currently in upload anymore

v1 - First Official Beta

add documentation how to install server on ubuntu 20.04 and add serve…