VS2010 compilation fixes

These capabalities were added on declaration of the members, but
that is considered too aggressive, as those members are automatically
declared in some shaders that don't use them.  Now, actual access
is needed to make the capabalities be declared.

Tests: Add support for testing file-based HLSL source code in GTest.

SPV: Handle matrix's OpFConvert vector by vector.

Parser: Add missing vector relational functions for double type.

Build: Minor android compile warning fix

* Fixes a warning - static function being defined but not used.
* Just in case any more code is added to DetachThreadLinux, this will go
  through the same path on both platforms.

Build: fix for -Werror=non-virtual-dtor for Android system builds

Parser: Redeclare gl_ClipDistance/gl_CullDistance should update their array sizes.

SPV: Add capability ImageGatherExtended if necessary.

Use strtoul instead of stoul for Android.

Add badge status for Appveyor build in README.

Configuration for Windows buildbot & fix a bug

We can have multiple instances of the same string, so comparing
const char* is not guaranteed working.

Fixed the failure on VS 2013 with Debug build.

Full stack: Support *precise* qualifier

Use proper precision qualifiers for bitfield build-in functions on ES

fix check for non-positive array size

Rebase to d3d3ce71,update comments, rename a member variable name, fix format issue

This change causes ES shaders to precision qualifiers for build-in functions as defined in ESSL spec. It especially mattersfor functions that are defined as highp or taking a highp.

Fixes vulkanCTS dEQP-VK.glsl.builtin.function.integer.bitfieldreverse.*, where bitfieldReverse() retval was wrongly marked as RelaxedPrecision.

Note: floatBitsToInt/floatBitsToUInt precision is also broken, but in different way - so it is not addressed here.