Fix rules update script

[KingSupernova31]

RG's CR is a year out of date for some reason. Fix whatever error caused this, and in accordance with #218, ensure that something like this can't happen again without emailing me about the error.

[KingSupernova31]

Ah, it's running out of memory and the OS is killing it silently.

Fix (do both):

• Make the regular jobs script detect if a subtask failed to finish, and throw an error if so.
• Make the update script use less memory, there's no reason it needs to load all cards and sets in memory at once.
• Add swap space.

[KingSupernova31]

Oh, if I end up just letting it use lots of memory, ensure that PM2 isn't going to kill it. --max-memory-restart 2G