Strange Aeons: Sword and Sorcery

Added Atum and ModTweaker, and using the latter changed the formula for Knightslime from Tinker's Construct. Also had to roll back to an earlier version of Antique Atlas, because evidently the one I was using was removed from Forge/Twitch for some reason.

I also added Realistic Block Physics, which is a pretty big change and will almost certainly cause some problems/weird behavior in some structures/dimensions. I excluded a few blocks from the new gravity rules. So while "sky bases" aren't completely impossible, they won't work with most blocks and you'll have to figure out which ones are exempted. Once I figure out the best configuration options to avoid problems in certain dimensions, I'll upload a new config file. There is an option to exclude dimensions, but I can't seem to get it to work without erroring the config file. You can always disable the mod in Twitch (or delete it from your mods folder) if it is causing problems.