The 3.0 reset

Big plumbing rebuild. Mostly invisible to players, but:

• Shared data addon (NerzorsBlacklistKeeper_Data) bundles textures, fonts and sounds. If this addon isn't active, the main addon warns you on login - please keep it enabled.
• Custom UI library under the hood - windows look more consistent and all sub-addons (Sync, Recents, RememberMe, Nameplates, Tooltip, ChatFilters, GroupFinder) feel like one cohesive whole.