feat: visual improvements

[kuruk-mm]

Fix https://github.com/decentraland/godot-explorer/issues/146

• [x] Decrease all graphic project settings to mobile (desktop will be affected) and set rendering target mobile
• [x] Add Graphic Profiles LOW, MEDIUM, HIGH and CUSTOM
• [x] Add three skyboxes: basic, normal, realistic
• • [x] Can change skyboxes at runtime
• • [x] A lot of tweaks on the WorldEnvironment and DirectionalLight
• [x] All materials are using diffusive mode and specular mode in toon
• [x] Add shadows (configurable quality or can disable)
• [x] Add anti-aliasing (configurable)
• [x] Add full-screen resolution: now is windowed, borderless and full screen
• [x] Fix wrong occlusion on empty parcels
• [x] Now avatars don't receive shadows (like Foundation Client, and better performance)

For another iteration:

• Skyboxes
• • Improve ´realistic´ skybox
• • Create day/light cycle
• • Create a cartoon skybox
• Take a look on the glow (disabled all the time)

[kuruk-mm]

Glow is disabled

Some devices are not working with Glow on mobile. I prefer to maintain it disabled.

Godot issue: https://github.com/godotengine/godot/issues/86621

[kuruk-mm]

Update snapshots. There are a lot of colour differences because of the tone map in ACES also diffusive mode and specular mode in toon