handle ISO date format in date fields for filter processing

[nfgusedautoparts]

< and > operations in JOSM filters currently appear to do straightforward text comparisons.
i suggest that when comparing tags that are supposed to contain dates in ISO format, that they be handled in this manner.
e.g., if i have start_date=1824-09-12 then the filter of start_date<1930 should handle this using the date fields in the obvious way.

[simon04]

I cannot reproduce. Related: #8850, r6429

Also note that:

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[nfgusedautoparts]

this isn't a bug report it is a feature request. so i'm not sure why the bug reporting elements are required.

[simon04]

Because:

• I cannot reproduce.
• I don't know which actions you are performing.
• I don't know the expected and actual results after those actions.
• I don't know the JOSM version you're using.

We do not ask those questions without reason.