Performance: Don't set the ID property for listed licenses

[goneall]

In the constructor for SimpleLicensingInfo, the call to setPropertyValue(SpdxConstantsCompatV2.PROP_LICENSE_ID, id); forces a fetch of the JSON file for the license which is unnecessary if the license is a listed license.

The same issue may occur with license exceptions.

[dwalluck]

Did you want to provide a little unit test that prints the timing information? I could run it and give you how long it takes (if that helps).

[goneall]

Turns out the fix was pretty easy - see PR #14

The performance is about 300ms to build the entire map for both spec version 2 and spec version 3 license maps.