warn about name=fixme and its variations

[Klumbumbus]

name=fixme, name=Fixme and name=FIXME are used 1214 times, see ​taginfo comparison

the count of all variations of the fixme word is even 1315, see ​http://overpass-turbo.eu/s/cSb

We should warn about this. Replacing it with fixme=name is not good, because the error can be detected by error tools even wthout this additional tag, see ​Key:fixme

Here is the test:

*[name][name=~/^(?i)fixme$/] {
  throwWarning: tr("Wrong usage of {0} tag. Remove {1}, because it is clear that the name is missing even without an additional tag.", "{0.key}", "{0.tag}");
  fixRemove: "name";
  assertMatch: "node name=fixme";
  assertMatch: "node name=Fixme";
  assertMatch: "node name=FIXME";
  assertNoMatch: "node name=valid name";
}

[Klumbumbus]

In 9088/josm:

fix #12133 - warn about name=fixme