Add `_debugDraw3DEnabled`, `_debugDraw3DColorHex` and
`_debugDraw3DDepthTest` to RuntimeInstanceContainer, plus a new
`enableDebugDraw3D(enabled, colorHex, depthTest)` method that mirrors
the existing 2D `enableDebugDraw`. When the settings change while a
draw is active, the existing wireframes are cleared so the renderer
rebuilds them with the new configuration.
`RuntimeScene.renderAndStep` calls `renderDebugDraw3D` each frame when
the flag is on — same hook point as the 2D debug draw.
The actual rendering is implemented in a follow-up commit.
* For now, this is limited to instances inside custom objects. This will be made available in the future for all instances in scenes if this works well.
* New actions are available to save & load the game state, making Saving & Loading as easy as adding 1 action to your game!
* While it will work in most cases, it has a few limitations and hasn't been thoroughly tested on all types of objects/behaviors and games, so it is for the moment tagged as **Experimental** while we gather feedback and improve it
* Check out the wiki for more info: https://wiki.gdevelop.io/gdevelop5/all-features/save-state
- Custom objects like the 3D particle emitter can be used as any other 3D object
- with the same set of actions and conditions thanks to the 3D capability
- in the scene editor, their Z position and 3D rotations can be changed
- Fix child creation in `doStepPostEvent` function
* This provides new 3D objects: 3D Box (perfect to create walls, floors, or billboards) and 3D Model (to import objects created in a 3D modeling app).
* 2D and 3D can be mixed in a same game. Each layer of a game can contain 2D objects, 3D objects or a mix of both.
* This allows to build 2D games, 2.5D games and full 3D games: platformers, racing games, FPS, hyper casual games. It's easy to start adding 3D objects to an existing 2D game.
* You can set up a light by adding an ambient light and/or directional light in the effects of a 3D layer. 3D objects can be configured to react to light or ignore it.
* In the future, support for 3D objects will be improved: light objects, animations, etc...
Aurélien Vivet