Build: Reorder fields to avoid compiler initialization order error.

HLSL: add in/out/inout qualifiers

HLSL: add offset Sample() form and arrayed texture support

HLSL: Sampler/texture declarations, method syntax, partial Sample method

Added -C option to request cascading errors.  By default, will exit early,
to avoid all error-recovery-based crashes.

This works by simulating end-of-file in input on first error, so no
need for exception handling, or stack unwinding, or any complex error
checking/handling to get out of the stack.

Added -x option to save SPIR-V as 32-bit hexadecimal numbers to a text file.

Includes adding test cases to verify the differences.

This is used by OpenGL, but not Vulkan.
Includes:
 - atomicCounter, atomicIncrement, atomicCounterDecrement
 - atomic_uint layout-offset checking
 - AtomicStorage capability

HLSL: Add template style constructors for vector & matrix types

This fixes issue #360.

Also, improve variable names. This grew to be overly hard to understand.

Suggest gl_[Vertex,Instance]Index when gl_[Vertex,Instance]ID is encountered in Vulkan GLSL

See issue #350 for detail.  This may be an ESSL specification issue.

HLSL: Change intrinsics tests to not use overloaded entry points

When parsing Vulkan GLSL, suggest gl_VertexIndex/gl_InstanceIndex instead of gl_VertexID/gl_InstanceID.

SPV: Certain decorations are missing for structure-typed in/out variables

HLSL: Add asdouble, fma, & mad intrinsics 

Remove duplicated tests from the runtests script.

Basic (component) type conversion was done, but checking that the composite
was correct was not being done.

Fixes issue #353.

This is to make the real change needed in the next commit easier.