Summary: Ref T6013. I accidentally made this cost explosviely huge when fixing macros for logged out users in D10411. Specifically, we'd load all the macros, which would load all the files, which would load all the macros (to do policy checks), which would fill out of cache I think (but maybe only some of the time?). Anyway, bad news. Instead, only load the files if we need them. Test Plan: Viewed macro main page, macro detail, used a macro, used a meme, edited a macro, edited audio. Reviewers: btrahan, csilvers Reviewed By: csilvers Subscribers: epriestley, spicyj Maniphest Tasks: T6013 Differential Revision: https://secure.phabricator.com/D10428