throw a warning for nodes with cycleway=crossing

[francians]

What steps will reproduce the problem?

1. create a node
2. add tag: cycleway=crossing

What is the expected result?

A warning could be thrown, since according to the spec is not valid:
​https://wiki.openstreetmap.org/wiki/Tag:cycleway%3Dcrossing

What happens instead?

Nothing.

Please provide any additional information below. Attach a screenshot if possible.

I've talked with local mappers and they agreed to change the node in highway and add bicycle=yes.

I suggest to add this rule to highway.mapcss:

node[cycleway=crossing] {
        throwWarning: tr("wrong crossing tag on a node");
        suggestAlternative: "highway=crossing";
        fixChangeKey: "cycleway => highway";
        fixAdd: "bicycle=yes";
}

Many thanks
Cheers
Francesco

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2019-07-10 00:52:47 +0200 (Wed, 10 Jul 2019)
Build-Date:2019-07-10 01:30:51
Revision:15238
Relative:URL: ^/trunk

Identification: JOSM/1.5 (15238 it) Linux Antergos Linux
Memory Usage: 1334 MB / 3541 MB (980 MB allocated, but free)
Java version: 1.8.0_181-b13, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: :0.0 1920x1080
Maximum Screen Size: 1920x1080
Dataset consistency test: No problems found

Plugins:
+ OpeningHoursEditor (34977)
+ PicLayer (35030)
+ buildings_tools (34982)
+ reverter (35084)
+ turnrestrictions (34977)
+ utilsplugin2 (34977)

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1

Validator rules:
+ https://josm.openstreetmap.de/josmfile?page=Rules/SuspiciousSwimming_Pool&zip=1
+ ${HOME}/JOSM/MyRules.validator.mapcss

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.