include setup in "WebSuite-Core"

[MarcTroll]

Adding the WebSuite-Setup-package (available here: https://github.com/NodeLabIT/WebSuite-Setup ) into the WebSuite-Core (more precise: As "plugin" downloaded on first start of the Docker-Image) has multiple advantages:

• Users doesn't have to install extra packages for setup
• Setup directly included in the Image, so it's also platform-indepenedent
• More possibilites to work with Core-Classes without adding them twice (In Core and Setup)
• More precise error-handling (using the websocket-integration from the Core itself)
• Easy to maintain: Only one "plugin" added to the Core instead of a "independent" software

By changing the Cores functionality to work more precise with Docker we cann add this Plugin in one.
See: #42 (comment)