Remember per-file 3D preview state in project files

[sczerwinski]

After reloading the project/file, all changes applied to 3D preview state (shading method, up vector, grid and axes visibility, etc.) are lost.

Plugin should save per-file 3D preview state in the project.

[sczerwinski]

See: https://plugins.jetbrains.com/docs/intellij/persisting-state-of-components.html
See: https://plugins.jetbrains.com/docs/intellij/plugin-services.html