Allow Game Scripts to post news items of non-basic types

[James103]

Currently, even though Game Scripts in theory can use any of several different news types (docs for GSNews), in practice, creating a news item via a Game Script is limited to the three basic news types: Economy, Subsidies, or General.

As far as I know, this is because all of the other news types involve a viewport or some other reference such as an engine or company, and are thus currently unsupported for creation by Game Scripts.

Would it be possible for Game Scripts to create such news items, as long as the correct references are set?

• News items with viewports require a reference to a valid tile or vehicle, or something that can be mapped to a tile such as an industry, station, or town.
• News items which show a company's manager (generally type GSNews.NT_COMPANY_INFO) require a title and a reference to an existing company to copy manager data from.
• News items which show a description of an engine, including "New engine now available" and the news items introduced in Feature: [Script] Allow GS to implement custom engine preview behavior. #14637, require a valid engine ID.