4.0.0

Merged multiple packages to this monorepo

• Deprecated Kentico Cloud model generator utility for Java
  was updated, re-branded, and merged to this repository as a Kentico Kontent model generator for Java
  subpackage
• Kontent delivery Java SDK was updated, rebranding was finished and now it is completely asynchronous!
  • Fix: #95. partly #85
  • Breaking changes
• New sample apps
  • Kontent Sample Java console app - mostly for exploring purposes
  • Kontent Sample Spring Boot Console App - Springboot sample app showcasing Thymeleaf templating engine demonstrating integration between SDK and Template Engine.