WQL array properties keep only their last element #189

Found during the pre-release documentation review (#187), by reading the code.

Problem

A WMI array property comes back with only its last element. Examples are IPAddress, IPSubnet and DefaultIPGateway in SELECT * FROM Win32_NetworkAdapterConfiguration, or Capabilities in Win32_DiskDrive.

WS-Management returns an array property as several sibling elements with the same name:

<p:IPAddress>192.0.2.10</p:IPAddress>
<p:IPAddress>fe80::1</p:IPAddress>

When the client builds each row, every element overwrites the previous one, so row.string("IPAddress") is "fe80::1" and the IPv4 address is lost without any error. Every WQL query goes through this code, fluent and legacy API alike.

A related inaccuracy: a WMI NULL (xsi:nil="true") comes back as an empty string, but the WqlRow.get() / string() Javadoc says they return null "when the property is absent or null". Today they only return null when the row has no such property.

Where

WsmanClient.collectRows(...) (src/main/java/org/metricshub/winrm/light/WsmanClient.java):

row.put(((Element) prop).getLocalName(), prop.getTextContent());

Expected

All the values of an array property are kept. How to expose them needs a decision, because the legacy API is consumed as strings (WinRMWqlExecutor.getRows() is List<List<String>>, used by MetricsHub):

• The fluent WqlRow.get(...) could return a List<String> for an array property.
• The legacy rows need a string. Check what 1.x (tag v1.1.02, CXF-based) returned for array properties before choosing, so existing consumers keep working.

Also align the WqlRow Javadoc with how a WMI NULL is represented (or map xsi:nil to null, if the legacy API allows it). Then update WQL Queries → Reading the result, which currently says values are the text WinRM sends and a WMI NULL is an empty string.