Clip commas from triggers

[DerekRoberts]

I keep needlessly and frustratingly putting commas in my arrays and assume others will be similarly daft at times. Add handling to clip commas.

E.g. ('one', 'two') is wrong, while ('one' 'two) is fine. Make both fine.

[DerekRoberts]

Bash arrays don't use commas, so we shouldn't either. Alternatively, we could look at another input format.