Fix for #302

[KristianKarl]

Working a on solution for #302 this PR contains

• dependency updates
• Removing the word gw3 used in graphwalker to only gw
• Replacing org.reflection to io.github.classgraph

So far this PR passes all tests locally. But I noticed that the tests consumes more memory. It also fixes #302 if studio is started using the PropertiesLauncher in spring boot, like:

java -Dloader.path=./some-plugin-generator.jar -cp ./graphwalker-studio-4.3.3-SNAPSHOT.jar org.springframework.boot.loader.PropertiesLauncher