layers: Implement VU 00303-00308

layers: Implement VU 00303-00308

Implement Valid Usages 00303-00308 with new function
ValidateBarrierLayoutToImageUsage() which verifies an
ImageMemoryBarrier's old/new ImageLayouts are compatible with its
Image's ImageUsageFlags.

Rename ValidateImageLayouts() to ValidateBarriersToImages().

Rename some variables:
- internal vars to use Google style.
- vars passed verbatim from Vulkan to use Vulkan names.

Fix issues revealed in layer tests due to these new checks:
- 2 new Unexpected messages in VkLayerTest.
- 1 failing VkPositiveTest.

Update VU database for check_implemented = Y.

Change-Id: I8723f99d515fbea707299b4d1fcf33a4da6b7b0b