chore: remove internal ai system for engine

[pollend]

This code is only used within the portal module I think we have other things that can easily replace this logic. need to review the impact and see what can be changed with the portal module. probably have something that can replicate the behavior we are looking for or potentially just shoveling this code into Spwaning?

I was looking at the Spawning module and it references Portals and then dead ends so its not referenced to any other modules. might be worth just dropping them from omega.

Depends on Terasology/Spawning#9

[skaldarnar]

I'm always a fan of removing code 🙃

For completeness, I'm pinging

• @Cervator as main author of Portals (I think)
• @casals as main driving force of AI topics
• (@jdrueckert @keturn as you may have looked at Spawning over the summer and usually have some opinion about adding/removing modules from Omega)

[casals]

Not sure if it's only a matter of transferring it to Spawning but yes, absolutely. As long as the dependencies are solved (just checking a full distribution should be enough), aye.

[pollend]

I would opt to move Portals and Spawnable to archive and maybe salvage the code for something else. @skaldarnar

[jdrueckert]

@pollend I created Terasology/Spawning#9 to make omega compile with this PR here. Spawning is currently still part of omega and the least we should do is keep it compiling. Even if we remove it from omega soon, as one of the modules that are hopefully finding their way back sooner than later, we should keep it in a good state as we can without investing too much resources - and just moving the files you remove here into there really wasn't much of an effort, it just needed to be done.

I'd appreciate a review on Terasology/Spawning#9 so we can get this PR here merged, too.