Load IKVM.Properties from RuntimeHost Configuration

[AliveDevil]

Allows for specifying system properties like java.net.preferIPv4Stack before JVM is initialized when consuming IKVM as a runtime library.

Usage:

<ItemGroup>
    <RuntimeHostConfigurationOption Include="IKVM.Properties" Value="java.net.preferIPv4Stack" />
    <RuntimeHostConfigurationOption Include="java.net.preferIPv4Stack" Value="False" />
</ItemGroup>

IKVM.Properties is semicolon separated.

[wasabii]

I might change this around to just have it all inside one comma separated option before release.

IKVM.Properties: java.net.preferIPv4Stack=False;prop=value;etc=foo

Worried about potential for overlap.