Add the rest of the major contests, .udc files and the registry

ARRL DX, IARU HF, Sweepstakes, RTTY Roundup, NAQP and general logging join
CQ WW and CQ WPX. The Cabrillo QSO line is now built column by column by the
contest, because Sweepstakes puts the callsign after the serial number where
everyone else puts it first.

User-defined contests read the subset of N1MM's .udc settings that covers the
exchange, the dupe rule, points and up to three multipliers.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/Nonemm.Contests.Tests/ArrlDxTests.cs

@@ -0,0 +1,55 @@
+using Nonemm.Contests.Rules;
+using Nonemm.Core;
+
+namespace Nonemm.Contests.Tests;
+
+public class ArrlDxTests
+{
+    private static ContestLog LogFor(StationInfo me) =>
+        new(new ArrlDx(ModeCategory.Cw), me, TestLog.CountryFile);
+
+    [Fact]
+    public void DxWorkingWvieScoresThree()
+    {
+        ContestLog log = LogFor(TestLog.Germany);
+        Assert.Equal(3, log.Judge(TestLog.Contact("K1ABC", exchange: "CT")).Points);
+    }
+
+    [Fact]
+    public void DxWorkingDxScoresNothing()
+    {
+        ContestLog log = LogFor(TestLog.Germany);
+        Assert.Equal(0, log.Judge(TestLog.Contact("JA1XYZ", exchange: "5W")).Points);
+    }
+
+    [Fact]
+    public void WvieWorkingWvieScoresNothing()
+    {
+        ContestLog log = LogFor(TestLog.UnitedStates);
+        Assert.Equal(0, log.Judge(TestLog.Contact("VE3XYZ", exchange: "ON")).Points);
+    }
+
+    [Fact]
+    public void DxCountsStatesAndProvinces()
+    {
+        ContestLog log = LogFor(TestLog.Germany);
+        Assert.Equal("CT", log.Judge(TestLog.Contact("K1ABC", exchange: "CT")).NewMultipliers.Single().Value);
+        Assert.Empty(log.Judge(TestLog.Contact("K1ABC", exchange: "XX")).NewMultipliers);
+    }
+
+    [Fact]
+    public void WvieCountsCountries()
+    {
+        ContestLog log = LogFor(TestLog.UnitedStates);
+        Assert.Equal("DL", log.Judge(TestLog.Contact("DL9XYZ", exchange: "100")).NewMultipliers.Single().Value);
+    }
+
+    [Fact]
+    public void MultipliersCountOncePerBand()
+    {
+        ContestLog log = LogFor(TestLog.Germany);
+        log.Add(TestLog.Contact("K1ABC", exchange: "CT"));
+        Assert.Empty(log.Judge(TestLog.Contact("K2ABC", exchange: "CT")).NewMultipliers);
+        Assert.Single(log.Judge(TestLog.Contact("K2ABC", 7_025, exchange: "CT")).NewMultipliers);
+    }
+}