Fix collisions between bool props with same name (issue #240)

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Solves issues that arise if a checkbox in an action step refers to a property with the same name as one present in an event step. (Fixes #240)

[Vegita2]

I think the best solution would be to remove all id's in widgets.
The idea was to make the label clickable to select the input, but that doesn't even work half the time, so I don't think we will lose much if we just remove them altogether. This could also happen to other widgets that set an id.