Add LDTK proof of concept

[mundusnine]

• Use premade assets like this
• Show a way of using ldtk maps to actually validate that the JSON schema and json atomics actually work
  • To actually prove this, we need to make an in-between layer that will keep the in editor state of the scene and send changes atomically
  • Our application will need to listen for filesystem changes
  • We need a parser to detect the changes in the data