Support deswizzle of sparse tiled textures and some frame buffer fixes (#275)

* Attempt to support deswizzle of sparse tiled textures

* Use correct frame buffer and viewport sizes, started to clean up the copy engine

* Correct texture width alignment

* Use Scale/Translate registers to calculate viewport rect

* Allow texture copy between frame buffers

Ryujinx.HLE/Gpu/Engines/NvGpuEngine3dReg.cs

@@ -6,12 +6,14 @@ namespace Ryujinx.HLE.Gpu.Engines
         FrameBufferNWidth    = 0x202,
         FrameBufferNHeight   = 0x203,
         FrameBufferNFormat   = 0x204,
-        ViewportScaleX       = 0x280,
-        ViewportScaleY       = 0x281,
-        ViewportScaleZ       = 0x282,
-        ViewportTranslateX   = 0x283,
-        ViewportTranslateY   = 0x284,
-        ViewportTranslateZ   = 0x285,
+        ViewportNScaleX      = 0x280,
+        ViewportNScaleY      = 0x281,
+        ViewportNScaleZ      = 0x282,
+        ViewportNTranslateX  = 0x283,
+        ViewportNTranslateY  = 0x284,
+        ViewportNTranslateZ  = 0x285,
+        ViewportNHoriz       = 0x300,
+        ViewportNVert        = 0x301,
         VertexArrayFirst     = 0x35d,
         VertexArrayCount     = 0x35e,
         ClearDepth           = 0x364,