[openstreetmap/openstreetmap-website] Show mailto: links for an email or emails separated by ; (#2542)

[mmd]

I ran the following Overpass query on an April 2019 planet:

```
[out:csv(::count, ::"count:nodes", ::"count:ways", ::"count:relations")];
nwr["email"];out count;
nwr["email"~"@"];out count;
nwr["email"~";"];out count;
nwr["contact:email"];out count;
nwr["contact:email"~"@"];out count;
nwr["contact:email"~";"];out count;
```

Test case    | @count | @count:nodes | @count:ways | @count:relations | 
|----|--------|--------------|-------------|------------------| 
| All email | 321586 | 223544       | 93158       | 4884             | 
| @ in email | 320877 | 223116       | 92896       | 4865             | 
| ; in email | 939    | 754          | 167         | 18               | 

Test case    | @count | @count:nodes | @count:ways | @count:relations | 
|----|--------|--------------|-------------|------------------| 
| All contact:email | 106861 | 72930        | 32617       | 1314             | 
| @ in contact:email | 106687 | 72805        | 32572       | 1310             | 
| ; in contact:email | 414    | 318          | 84          | 12               | 


My conclusion would be  that semicolons in email addresses are a fairly niche requirement as they don't even affect 0,5% of all objects. I would just ignore those, it's not worth the effort.

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