Too many refactors in one:

- Allowed adding ephemeral(ish) views and functions
- Moved message_count to a concrete database field
- Moved most proxy logic to a stored procedure
- Moved database files around and refactored schema manager

PluralKit.Bot/Handlers/ReactionAdded.cs

@@ -58,7 +58,7 @@ namespace PluralKit.Bot
 
         private async ValueTask HandleDeleteReaction(MessageReactionAddEventArgs evt, FullMessage msg)
         {
-            if (evt.Channel.BotHasAllPermissions(Permissions.ManageMessages)) return;
+            if (!evt.Channel.BotHasAllPermissions(Permissions.ManageMessages)) return;
             
             // Can only delete your own message
             if (msg.Message.Sender != evt.User.Id) return;