Added questionmark icons

I suppose if a category is marked "?", then in the details view its functions should be marked "?" unless they have been explicitly stored otherwise - in which case there probably shouldn't be any prompts.

#### Here's what I think should be in the prompt

* The choice between the function & the category
* The choice of duration: once, 10 mins, always
* The choice to Allow or Deny

That should cover pretty much all use cases that people could think up & I don't think we can simplify the available choices without getting complaints.