Improve the OOP ABI

[Alexandru Ermicioi]

On Thursday, 28 September 2023 at 19:25:15 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
> I said this on Discord, but that means all TypeInfo has to be 
> exported, even for executables.

There might be an issue when your lib uses two other libs, and 
both of them use lib X but of different versions. This might 
cause issues with exported structures when they differ from 
version to version, and etc. Could this also be an issue for 
exported TypeInfos?