change: .exexport will now have a timestamped name along with the server id

added: Added `.afk <msg>?` command which sets an afk message which will trigger whenever someone pings a user.

fix: You can once again disable cleverbot responses using fake 'cleverbot:response' module name in permission commands

add: Added .keep command which will add the current guild to the list of keptguilds. This is needed for the future database purge.

dev: refactored .bible and .quran, moved to their own folder and created ReligiousApiService for their logic

docs: upped version to 5.1.5
dev: removed nuget.config as we no longer rely on myget
dev: Fixed some build warnings