Avoid problems with mod and patch overload

[Iritscen]

We have a report of 60 mods causing Oni to run out of memory, and of too many particle mods crashing Oni. Either prevent user from checking too many mods, or else count the number of potentially-problematic files for a more intelligent solution. But first we need to work out what kind of limits we're up against.

[Iritscen]

ticket:27 tells us one of the more important limits: 1024 particle classes. Until such time as the Daodan raises a limit like this, the AEI should currently be warning users when their selected mods, plus Oni's, pass a limit like that.