REM events to JS

Can't find a snappy way to get rid of V.REM. In the TW, a roll sets this global, which in turn determines if the event can happen, and then when if it does, what the contents are. I can do a similar roll in get weight, but can't really preserve it without using the same global.

@lowercasedonkey A given event instance persists. Within an event, you can store parameters on the this.params object...there should be some existing examples of this.

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