Add DMS and UTM initializers for Coordinate3D (#53)

[trasch]

Summary

Added coordinate format initializers for DMS (Degrees, Minutes, Seconds) and UTM (Universal Transverse Mercator).

Coordinate3D(dms:)

• Parses strings like "40°26'46\" N 79°58'56\" W"
• Supports space-separated format "40 26 46 N 79 58 56 W"
• Handles primes, double primes, degree symbols

Coordinate3D(latitudeDegrees:latitudeMinutes:...)

• Explicit DMS component initializer

Coordinate3D(easting:northing:zone:hemisphere:)

• UTM to WGS84 conversion using standard WGS84 ellipsoid parameters
• Handles northern and southern hemispheres
• Validates UTM zone range (1-60)

Tests (8 tests)

Test	Coverage
dmsString	Standard DMS format
dmsStringSpaceSeparated	Space-only format
dmsStringEast	Eastern longitude
dmsStringSouthWest	Southern hemisphere
dmsComponents	Explicit component init
utmNorthern	UTM zone 18N
utmSouthern	UTM zone 56S
utmInvalidZone	Out of range zone → nil

Test results

274 tests pass across 60 suites (+8 new).

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Closes #53