TODO updates: add information about verification of seeds/caches/configs/specs, updat...

TODO updates: add information about verification of seeds/caches/configs/specs, update automated actions section in targets, add all-stages and all-images target information, clean up system and world target information, add information on improving caching/resuming, move mixed host/target information into targets section, add information on replacing livecd-tools (hwdata/libkudzu/hwsetup) with internal code, and fixing the spacing.