loader: Fix a 1.0/1.1 versioning bug

Fix a bug where when mixing a 1.0 and a 1.1 driver, if the loader
stores the 1.0 driver first, the apiVersion field in vkCreateInstance
will be rewritten to 1.0 for both drivers. Now it will only be
changed for the 1.0 driver, as intended.

Change-Id: I9e7c5e0b0b7c0eb660082319dcddd9e8ef8adc61

build: Update to 1.1.70

winsdk: Update runtime installer copyright to 2018

Change-Id: If27613c85c754d4a54f5afa4dd3a6976695b227e

build: Remove Mock ICD JSON file from install target

The mock ICD shouldn't be installed or be part of packages
that use the "make install" target to create packages.
The mock ICD shared lib wasn't added, but the JSON was.

winsdk: Move file copying into NSIS installer

Change-Id: If01c5024af802be784d5ea0f897cebdcc604934d

demos: Clarify cube --present_mode option

Change-Id: Ie53724c3612eb5bb9adfbb826149ef87916f0d84

header: revert constexpr change in vulkan.hpp

constexpr was previously removed to preserve compatibility with Visual
Studio 2013.  This causes linker errors when vulkan.hpp is included in
multiple file.

Change-Id: I3a301c669ceb300f49982abacdb21543ea8ee764

build: Update for 1.0.61.0 SDK

Change-Id: I4b1f0289dace648153b6efdbfea0d83d37b28e60

loader: Replace overzealous warnings with info

The new ICD search functionality was logging warnings in some places
where information was more appropriate, such as when opening a device
or for some errors that simply indicated that the new format is not
supported yet.

Change-Id: Ifc8ce33d778783f3f55102783bf6ede0dd7c2a00

layers: Update PV codegen for Windows warning

Code gen declarations of allowed_structs in nested scopes could cause
warnings in Windows.  Modified codegen to append the type name to
allowed_structs (eg allowed_structs_VkGraphicsPipelineCreateInfo) to
avoid name collisions.

Change-Id: I40bd57ff34dcd1df01d3606c79dacbe06b00f464