SkyUI BSA script conflicts

[sibir-ine]

We have two message informing users when a mod they've installed overwrites an essential SkyUI script, ski_playerloadgamealias.pex, with an older version that interferes with SkyUI's operation. In combination, they check if a user has the old script installed loose or a BSA loaded that is known to contain it. However, as of v0.19.0, LOOT takes BSA asset overlaps into account when sorting similar to record overlaps. Now that LOOT takes these overlaps into account, it'd be helpful to do so to some extent when considering load rules between plugins. In this case, we could simply remove Sky UI from the Fixes & Resources group & load it after the plugins known to load BSAs with the old script, avoiding the need for users to remove the script & repackage the BSAs themselves. We could then remove one of the messages & simplify the condition of the other drastically.

SkyUI doesn't overwrite any vanilla records, & it only overwrites some vanilla interfaces, so adding these rules shouldn't have many unforeseen consequences. The only thing we may want to check first is if the load rule placing iNeed.esp after SkyUI is really necessary. It was added in #747 & appears to be necessary, but it may be worth double-checking, possibly with iNeed Continued as well.