[openstreetmap/openstreetmap-website] Add changeset upload modifiers (#1389)

[mmd]

> This will significantly improve once changeset upload is available via cgimap

New changeset upload is deployed for testing here now: https://upload.apis.dev.openstreetmap.org/user/mmd2/diary/1 

@woodpeck : https://github.com/woodpeck/osm-revert-scripts unfortunately doesn't have "Issues" enabled, that's why I'm adding a few comments here:

While reverting large changesets via JOSM reverter is very fast, I had mixed results with the osmtools reverter. Maybe I'm doing something wrong here, but it seemed that downloading objects took quite some time already. The upload process only improved after activating setting some $transaction = 1 flag.

Maybe it would make sense to investigate, if downloading multiple object versions at once might be an option (--> [multi fetch](https://wiki.openstreetmap.org/wiki/API_v0.6#Multi_fetch:_GET_.2Fapi.2F0.6.2F.5Bnodes.7Cways.7Crelations.5D.3F.23parameters)). If gathering old object version is fast, it would significantly reduce the risk for version conflicts.

My expectation is that a large changeset should be reverted in less than 1 minute, with the upload taking less than 10s.

Feel free to use the dev instance for testing and report back any concerns/issues or even success stories. Having strong reverter tooling support is essential, after all.

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