Idea: add ProjectSettings attribute

[michaeldomanek]

In my current project is use e.g. default gravity from the project settings:

ProjectSettings.GetSetting("physics/2d/default_gravity")

Would be cool to have something similar for like [LayerNames] for project settings.

[ProjectSettings]
public static partial class MyProjectSettings;

generates something like:

public static partial class MyProjectSettings
{
    public const float DefaultGravity2d = 980f;
    ...
}

Don't know if it possible but maybe you could check, also thanks for the work so far.