Fixes Listing Info Retrieval Handling when Slow

[Step7750]

Issue:
Sometimes the page doesn't reply with listing info fast enough and retrieveListingInfoFromPage returns null data in the promise.

Fix:
Delays the timeout for retrieving to 10ms. In the vast majority of
cases, it will be retrieved in under 10ms. If it still takes longer,
retrieveListingInfoFromPage rejects the promise. If the promise is
rejected for a single listing, the listing text is updated (to prevent
an infinite loop if they're on a new page). If the promise is rejected
for 'Get all floats', it tries again.

[bmwalters]

I'd say a better approach would be to store all the promises we need to resolve somewhere, then when we receive the message from the page in the event handler, resolve them all. That way, we wouldn't need to worry about the exact amount of time.
You can take a look at 8967ba6

[Step7750]

@bmwalters I just finished my commit as I saw yours, haha. I think my approach is pretty clean and just stores the resolve objects. If the id isn't in the listing data on an individual listing, it silently fails and the user must have switched pages. This approach also allows us to get rid of the reject handlers like before, but I guess it is helpful at times to have them so....

916fb24

[Step7750]

@bmwalters Which approach would you go with?