Extending features & libraries (collective ticket)

[betacore]

• jvmTarget missing in pom: <kotlin.compiler.jvmTarget>1.8</kotlin.compiler.jvmTarget>
• Adding base docker-compose.yml with initial jira container on 8080 for confluence plugin
• Change port of frontend to 9000 to avoid conflicts with jira docker container on 8080
• Adding kotlin coroutine dependency
• Adding kotlin arrow dependency
• Adding active objects library with example
• Adding DBOperator to default plugin
• Adding rest endpoint example to default plugin
• Adding install script with versions and version "latest"
• Adding basic architecture packages (operator, service, routes, ...) for backend
• Adding run-config for "make home"
• Adding basic error handling with standard error data class and arrow