OpenAssetTools/test/SystemTests/Game/T6/ExtendAndDereference

Extend and dereference system test

This makes sure that when reusing assets from an existing zone, asset dependencies that are references can be overwritten to be non-references.

In this case:

• The zone ZoneWithTechsetT6 contains the techniqueset trivial_floatz_2992w610
• The zone ZoneWithMaterialT6 contains the material test and with a reference to its techniqueset ,trivial_floatz_2992w610
• The final zone CombinedZoneT6 is built while loading both of the other fastfile and is expected to contain both the material test with a reference to a (actual asset, not a reference) techniqueset trivial_floatz_2992w610