Split GUI into its own jar

[hlxid]

Description

The compiled GUI is currently included in the jar of the framework.
The GUI should be split into its own jar that is deployed alongside the jar of the framework and api. This way we align to that every repo that is deployed gets its own jar.

References

#17 has added the sbt gui task that needs to be reworked.

chatoverflow/project/BuildUtility.scala

Lines 229 to 230 in 6ded482

	// Copy built gui into resources, will be included in the classpath on execution of the framework
	sbt.IO.copyDirectory(outDir.get, new File("src/main/resources/chatoverflow-gui"))

Here the gui is copied into the resources of the framework. Instead a new jar has to be created, included in the deploy task and be put on the classpath in order to support the execution of the project with IntelliJ.