Add units for coordinate components in CRS response

[Kristian Evers]

When querying a specific CRS we are told which components a coordinate is made up of but not their units. E.g.

$curl http://127.0.0.1:5000/v1.0/crs/EPSG:25832
{
    country: "DK",
    title: "ETRS89 / UTM Zone 32 Nord",
    title_short: "ETRS89/UTM32N",
    v1: "Easting",
    v1_short: "x",
    v2: "Northing",
    v2_short: "y",
    v3: "kote",
    v3_short: "h",
    v4: null,
    v4_short: null
}

This makes it problematic for consuming apps to display the correct unit of a specific coordinate. The CRS response should be expanded to also include the units, e.g.:

$curl http://127.0.0.1:5000/v1.0/crs/EPSG:25832
{
    country: "DK",
    title: "ETRS89 / UTM Zone 32 Nord",
    title_short: "ETRS89/UTM32N",
    v1: "Easting",
    v1_short: "x",
    v1_unit: "m",
    v2: "Northing",
    v2_short: "y",
    v2_unit: "m",
    v3: "kote",
    v3_short: "h",
    v3_unit: "m",
    v4: null,
    v4_short: null,
    v4_unit: null,
}

The change is fairly simple and should mostly be a matter of expanding the contents of webproj\data.json.