[core] Refresh the 'AmInterested' status regularly #601
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There are several cases where the 'AmInterested' status can change for a given peer, and it's not easy to provide an event for each of these.
For example, the 'interested' status is dependent on each bitfield added as an 'IgnoringBitfield' to the piecepicker. These bitfields can change arbitrarily. This async check will ensure that things will refresh regularly.
As updating the priority of a file does have a pretty clear user action associated with it, special case this to cause an immediate refresh of the 'AmInterested' status.
Fixes #597