Better handling of semicolon in values: Validator warnings/errors

[Don-vip]

Continuation of #9104. Remaining task:

Validator warnings/errors about semicolons in values where it makes no sense as many keys need single value to work.

See ticket:9104#comment:6 and ticket:9104#comment:8 for material.

[naoliv]

I use a test for the more common keys:

*[name =~ /.+;(.+)?/],
*["addr:street" =~ /.+;(.+)?/],
*[lanes =~ /.+;(.+)?/],
*[highway =~ /.+;(.+)?/],
*[surface =~ /.+;(.+)?/],
*[maxspeed =~ /.+;(.+)?/] {
        throwWarning: tr("verify: {0} with multiple values", "{0.key}");
}

[Don-vip]

In 6928/josm:

fix #9757 - validator warning for wrong multiple values (patch by naoliv)