Add configurable "Net Promoter Score (NPS)" collection as part of the Feedback

[rm3l]

See https://en.wikipedia.org/wiki/Net_Promoter, which could be added to the Feedback form view as follows:

How likely are you recommend {{App_Name}} to a friend or co-worker?

Not at all likely 0 1 2 3 4 5 6 7 8 9 10 Extremely likely

As usual, all messages should be configurable.