Implement Intellij visualisation plugin

[nsk90]

PSI plugin can highly improve library usability. Common visualisation tools like pluntUml or mermaid and even graphviz cannot draw complex state machine structure correctly.

[nsk90]

I will start here https://github.com/KStateMachine/kstatemachine-intellij-platform-plugin

[nsk90]

the plugin will be available soon. works cool, even better than I expected.