automatically save changes to home world

[zodiepupper]

when starting up the game, we should resume the previous state of the homeworld.

this entails finishing up the interchange format... so this might take a while.

my want is to use a gltf extension that just bundles all the godot data into the gltf so that when a gltf is loaded it just looks for and applies the godot specific data that's present in the gltf. this would also make for a good interoperable export format, where it will import with normal gltf features, but if the platform implements the extension, it will be able to load it with all the functionality it had in godot.

we might also be able to use this setup to generate deltas and use those for network scene updates.

[zodiepupper]

frankly not sure exactly how i wanna do this rn. i think i wanna finish my changes to the journal import/export or maybe work on some other export format. i just don't know if loading a scene is a good idea for the local world. we'll see. i need to think about it more.

[zodiepupper]

i think we should make this an explicit action instead of automatic. or maybe do like other apps, where the cleanup step on close includes auto saving.