[heist] target char limits results in error

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error shows in servers bot-logs when targets are added that exceed character limit, resulting message is as shown

This has not resulted in any crashes, but would be a much needed fix.

To reproduce:

1. make many targets until char limit is reached
2. get error message and receive error in bot log

Possible solution could be either allowing targets to go through multiple messages, or adding multi-page functionality for the targets.