Maximal count of messages that can be send in a single @delayed

[lucblender]

As we already discussed

Another useful thing would be a setting to limit the maximal count of messages that can be send in a single @delayed message as there might be devices with memory constraints that will not be able to hold tousands of those messages in memory.

I'll create an issue on this

Originally posted by @lucblender in #28 (comment)