ECS refactor

[FiniteReality]

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? Refactors ECS to follow the new engine module architecture.

Is there an open issue that this resolves? Nope.

What is the current behavior? No ECS. @RubyNova sad.

What is the new behavior? ECS. @RubyNova happy.

Does this PR introduce a breaking change? Yes?

Other information