Add RSS feed, limited by bbox or country

[stefanb]

...to allow filtering to an area of interest and propagating errors via other, non-web channels.

It can be split down to 2 relatively independent functionalities:

• RSS feed
• Limiting the results by bbox or country (note that filtering by counties may be broken if country relations are broken)

Example of existing RSS feeds in #slovenia-feeds slack channel:
Closed OpenStreetMap Notes (past 7 Days) - Feed for Slovenia
URL: https://resultmaps.neis-one.org/osm-notes-country-feed?c=Slovenia&a=closed

Reopened OpenStreetMap Notes (past 7 Days) - Feed for Slovenia
URL: https://resultmaps.neis-one.org/osm-notes-country-feed?c=Slovenia&a=reopened

Commented OpenStreetMap Notes (past 7 Days) - Feed for Slovenia
URL: https://resultmaps.neis-one.org/osm-notes-country-feed?c=Slovenia&a=commented

Opened OpenStreetMap Notes (past 7 Days) - Feed for Slovenia
URL: https://resultmaps.neis-one.org/osm-notes-country-feed?c=Slovenia&a=opened

Latest OpenStreetMap Contributors (last 7 Days) - Feed for (13.98612 47.14905,15.98612 45.14905)
URL: http://resultmaps.neis-one.org/newestosmfeed.php?lon=14.986119&lat=46.1490535&deg=1

Find Suspicious OpenStreetMap Changesets
URL: https://resultmaps.neis-one.org/osm-suspicious-feed-bbox?hours=96&mappingdays=-1&tsearch=review_requested%3Dyes&anyobj=t&bbox=13.375469,45.421425,16.596769,46.876682

OpenStreetMap GPS Traces
URL: https://www.openstreetmap.org/traces/tag/Slovenija/rss

OpenStreetMap GPS Traces
URL: https://www.openstreetmap.org/traces/tag/Slovenia/rss

Latest OpenStreetMap OSM Changeset Discussions - Feed for Slovenia
URL: http://resultmaps.neis-one.org/osm-discussions-feed?c=Slovenia

OpenStreetMap diary entries in Slovenian
URL: https://www.openstreetmap.org/diary/sl/rss

OpenStreetMap Forum / users: Slovenia
URL: https://forum.openstreetmap.org/extern.php?action=feed&fid=58&type=atom

...and possibly others

[DavidKarlas]

I'm leaning towards adding BBOX to issues, and let server/RSS service do BBOX matching...