0 indexed arrays have been a staple in java and other languages for years. (Despite their confused origins)
We aren’t java though, so we can decide for ourselves whether or not to use 0 or 1 indexed arrays. The decision to use 0 indexed arrays was questionable considering TriggerReactor’s goals, but it’s not something we can easily change at this point...
The command interface on the other hand makes no sense as a 0-indexed system. The pages of /trg help shouldn’t count from 0... page 1 should be the first page. I have similar opinions of the rest of the commands including

• /trg help
• /trg item lore set|remove
• /trg inventory item|row|column

Done in c320a50