layers: Update layers to 1.0.32

Change-Id: Iee12463c55fa71f40d0a3ae946025430442fc974

vktrace: Remove pageguard changes for SDK 1.0.30.0

Change-Id: If12144d9903f55f339d5d42e8e08fa50bf91266c

loader: Add back func calls

Previously removed function calls in extension_create_instance
because I believed they were no longer needed.  I was incorrect.

Change-Id: Ibc63009f0038a413b7e1bc03225818b046a62352

layers: Fix Dota2 crash in Windows

Two issues, in_use was not initialized in SAMPLER_NODE and an invalid
access during resource tracking for SAMPLER_NODE and SET_NODE. This
occured during GetFenceStatus after a call to DestroySampler.

Change-Id: I7654a7c4a2677450097643422f44290be5dbac2a

loader: Clean up some things in the MD file

Clean up some documentation in the LoaderAndLayerInterface
markdown.  Over the next few weeks, I'll be working on
cleaning up the format and language of this doc.

Change-Id: I7858981293de9befb34701c31542d88c664cd6d8

Merge branch 'trunk'

vktrace: Move null instance check after rest of setup

Change-Id: I7ebcf6d826f6c97990ce4db7b9c5bdc1ec8862c3

doc: add deps to BUILDVT.md

doc: add deps to BUILDVT.md

loader: `Remove the ICD and Layers search path for Windows

This makes it more like Linux which leaves it up to the system
LoadLibrary() call to find the .dll as specified in the .json files.
Hard-coding "C:" or any other search path creates the possibility of
picking up the wrong .dll. The LoadLibrary() implementation does the
right thing.

Change-Id: I58cbdf230a1e86481067efb4aec03447ee55f1ff