Make a form based trigger

[brendanheywood]

This is a trigger which run a workflow which is essentially always going to be manual, but it needs to have certain fields in a certain shape (like an event or webhook) in order to work.

So this trigger will define a list of fields, and when you run the trigger you get the form which populates those fields and validates them and then kicks it off. Very similar to the customsql reports which require input.

Nothing too fancy, just a list of fields and types and a comment like this:

name,text, description
age,int,description
...