ubershader: fix reflection under Rembrandt

ubershader: fix reflection under Rembrandt

model-combined & model-combined-deferred effects: improve Rembrandt behaviour, and provide better effects for transparent
surfaces under Rembrandt.

This change breaks current effects using normalmaps when inheriting from model-combined-deferred under
Rembrandt.
Aircraft developers please change the technique numbers in the "normalmap include" part of your effects file from
<technique n="8"> to <technique n="7"> (again, only if inheriting from model-combined-deferred, and using normalmaps)

Effects inheriting from model-combined do not neeed any adaptation.

Sorry for the nuisance caused by this change.

Signed-off-by: Emilian Huminiuc <emilianh@gmail.com>