Feature/mvp UI system

[RubyNova]

Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Documentation has been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) this introduces the required changes for our minimal imgui system.

Is there an open issue that this resolves? If so, please link it here. resolves #348 (I think)

What is the current behavior? (You can also link to an open issue here) We have no UI

What is the new behavior (if this is a feature change)? We have a UI

Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) No

Other information: N/A