change "interactive" setting on tool and question basis

[garethjenkins]

global setting to disable interactive on all elements

• so nothing gets a background

element-level setting to set not interactive (if not already set)

for each tool, assess whether to set interactive

for each tool set global disable if no interactivity is used with btxe

e.g. in nbonds -- RNWJA1KQ-WAZ4-YH50-PB6W-A8HKXRTBKYVQ