[openstreetmap/openstreetmap-website] improve browse and history "pages" by highlighting changes (#1253)

[dieterdreist]

It would be convenient to show also summaries in object history and browse pages and highlight the kind of change, for example:
## on browse pages:
### for nodes+ways+rels:
amount of tags (useful for objects with lots of tags)
### for ways:
amount of nodes
### for rels:
amount of members (or nodes and ways and rels members)

## in history:
### generally
highlight the kind of action by formatting (similar to how it is already done for deleted objects in changesets):
e.g. show new objects / tags bold (and or e.g. green)
show deleted tags (that are in version n but not n+1) as strike through (and or red) in version n+1
### for nodes+ways+rels:
amount of tags (useful for objects with lots of tags), separated into amount total+added+deleted (compared to previous version)
### for nodes:
position changed?
### for ways:
amount of nodes total,removed and added (compared to previous version)
### for rels:
type changed (only displayed if yes, e.g. type changed from x to y)
amount of node members total,removed and added (compared to previous version)
amount of way members total,removed and added (compared to previous version)
amount of role changes

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https://github.com/openstreetmap/openstreetmap-website/issues/1253
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