Create a reverted-map

Idea Source: https://www.openstreetmap.org/user/pitscheplatsch/diary/401668

Idea:

1. search for all changesets that mention the word "revert"
2. filter all elements that have been touched by these changesets
3. use the code here: https://github.com/GIScience/oshdb/issues/507 to extract all elements that have experienced a revert in their state before and after the revert
4. create a new tab on the deleted map that only shows theses elements in two different layers (may need adjustement depending on how the data looks like)