Include JVM languages

[rawdog71]

Include JVM languages in backend to code business logic for the templates. Right now, the business logic can be implemented directly in the Freemarker/Velocity templates. To split this up and encourage devs to code business logic in JVM languages, it should be integrated in the backend aswell.

First language support should be JAVA for a proof of concept.

[Hat-Kid]

• [x] Add Java editor
• [x] Implement Java compiler at runtime and load compiled classes
• [x] Add drop down to select other languages

[rawdog71]

• [x] Add Tab for external libraries
• [x] Add Maven repository for external JAVA libraries

[rawdog71]

Classpath reloading problem fixed!

[rawdog71]

Added Kotlin and Groovy support

[rawdog71]

Added a classBean for templates that holds a map of instantiated classes.

The template looks like this: <#assign classbean = classBean> <#assign testclass1 = classbean.newInstance("TestClass1", "io.clownfish.java.TestClass")> <#assign testclass2 = classbean.newInstance("TestClass2", "io.clownfish.java.TestClass")> ${testclass1.method()} ${testclass2.method()}

[rawdog71]

Added Scala to the JVM languages