Revision of logger and console system

[TheMeinerLP]

Description of the new feature:

To get a better overview and easier implementation of several things I would like to change the logger system to log4j2 with combination of JLine3.
JLine3 should be based on an Observe pattern. This makes it possible to handle the console better for setup system or command system

Reasons for inclusion into the CloudNet code base:

Because this is an essential part of the cloud and cannot be changed by modules. And not even by plugin

Planned audience:

All users, as it is the input and output of the cloud

Preview of code and documentation:

Additional context:

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[GiantTreeLP]

Whatever you are using to create that diagram: stop using it, I can't make out anything over these "UNREGISTERED" watermarks.

[TheMeinerLP]

It is STARUML