Rendertarget attachments, texture and image changes (#358)

* Add multiple color outputs for fragment shaders

* Add registers and gal enums

* Use textures for framebuffers and split color and zeta framebuffers

* Abstract texture and framebuffer targets as an image

* Share images between framebuffers and textures

* Unstub formats

* Add some formats

* Disable multiple attachments

* Cache framebuffer attachments

* Handle format types

* Add some rendertarget formats

* Code cleanup

* Fixup half float types

* Address feedback

* Disable multiple attachments in shaders

* Add A4B4G4R4 image format

* Add reversed section for image enums

Ryujinx.HLE/Gpu/Engines/NvGpuEngine3dReg.cs

@@ -22,7 +22,14 @@ namespace Ryujinx.HLE.Gpu.Engines
         StencilBackFuncRef   = 0x3d5,
         StencilBackMask      = 0x3d6,
         StencilBackFuncMask  = 0x3d7,
+        ZetaAddress          = 0x3f8,
+        ZetaFormat           = 0x3fa,
+        ZetaBlockDimensions  = 0x3fb,
+        ZetaLayerStride      = 0x3fc,
         VertexAttribNFormat  = 0x458,
+        ZetaHoriz            = 0x48a,
+        ZetaVert             = 0x48b,
+        ZetaArrayMode        = 0x48c,
         DepthTestEnable      = 0x4b3,
         IBlendEnable         = 0x4b9,
         DepthTestFunction    = 0x4c3,
@@ -44,6 +51,7 @@ namespace Ryujinx.HLE.Gpu.Engines
         StencilFrontFuncMask = 0x4e6,
         StencilFrontMask     = 0x4e7,
         VertexArrayElemBase  = 0x50d,
+        ZetaEnable           = 0x54e,
         TexHeaderPoolOffset  = 0x55d,
         TexSamplerPoolOffset = 0x557,
         StencilTwoSideEnable = 0x565,