Flatten uniform arrays

This checkin adds a --flatten-uniform-arrays option which can break
uniform arrays of samplers, textures, or UBOs up into individual
scalars named (e.g) myarray[0], myarray[1], etc.  These appear as
individual linkage objects.

Code notes:

- shouldFlatten internally calls shouldFlattenIO, and shouldFlattenUniform,
  but is the only flattening query directly called.

- flattenVariable will handle structs or arrays (but not yet arrayed structs;
  this is tested an an error is generated).

- There's some error checking around unhandled situations.  E.g, flattening
  uniform arrays with initializer lists is not implemented.

- This piggybacks on as much of the existing mechanism for struct flattening
  as it can.  E.g, it uses the same flattenMap, and the same
  flattenAccess() method.

- handleAssign() has been generalized to cope with either structs or arrays.

- Extended test infrastructure to test flattening ability.

glslang/MachineIndependent/Intermediate.cpp

@@ -424,6 +424,11 @@ TIntermTyped* TIntermediate::addConversion(TOperator op, const TType& type, TInt
         // opaque types can be passed to functions
         if (op == EOpFunction)
             break;
+
+        // HLSL can assign samplers directly (no constructor)
+        if (source == EShSourceHlsl && node->getBasicType() == EbtSampler)
+            break;
+
         // samplers can get assigned via a sampler constructor
         // (well, not yet, but code in the rest of this function is ready for it)
         if (node->getBasicType() == EbtSampler && op == EOpAssign &&