FramebufferManager: Return the depth texture instead of the color texture in GetResolvedEFBDepthTexture() when AA is enabled.
FramebufferManager: Support resolving a multi-layered EFB in D3D.
FramebufferManager: Support resolving a multi-layered EFB in OGL.
OGL: Fix OGL3 with stereo enabled
OGL: move osd warning for not supported stereo mode into config validation
Merge pull request #1738 from degasus/master

OGL: Fix OGL3 with stereo enabled
Merge pull request #1720 from Armada651/stereo-msaa

FramebufferManager: Support resolving a multi-layered EFB
FramebufferManager: Copy all EFB layers to the XFB framebuffer.
OGL: Support stereoscopic XFB blit to screen.
FramebufferManagerBase: Only allocate one layer for Real XFB.
GeometryShaderCache: Cosmetics.
FramebufferManager: Copy all EFB layers to the XFB.
D3D: Support stereoscopic XFB blit to screen.