HLSL: Support string literals, e.g, for annotations

SPV: Some group invocation operations should be applied to scalars.

This includes all "per variable" layout qualifiers, but the
key ones mattering and tested for now are:
  set=
  binding=
  constant_id=
  push_constant

SPIRV remapper: allow 64 bit literals in OperandVariableLiteralI…

HLSL: changing SPIRV defualt language for HLSL to unknown

fix x64 warning about conversion size_t -> int

Revert "Merge pull request #456 from steve-lunarg/remapper-literal64"

This reverts commit ad08b30f, reversing
changes made to 28660bb5.

This backs out the pull request
https://github.com/KhronosGroup/glslang/pull/456 because it introduced
several internal errors even on code that only uses 32-bit numeric
types.

SPIRV: Remapper: allow 64 bit literals in OperandVariableLiteralId iteration

Allowing explicit specification of shader compiltion type via -T opti…

Build: Bump required CMake version down to 2.8.11

HLSL: Put all intrinsics in common stage symbol table

Fixes issue #370 and replaces PR #371.

HLSL: add implicit promotions for assignments and function returns.

Allowing explicit specification of shader compiltion type via -T option, rather then looking at file extension. For HLSL files, this is nice because .hlsl extension is natively udnerstood by visual studio, likely to be used with the -e option.

Yield a vector relational compare and a vector result.

HLSL: disabling dx9 attempt to parse dx9 style samplers

Integrating Master into dankbaker fork

When preprocessing only, some tokens were emitted as <bad token>.
This fixes them to preserve their original content.

This supplants PR #182, with a correction and test results.

HLSL: Add GatherRed/Green/Blue/Alpha methods, inc 4-offset forms