[GPU] Track unaligned (visible) block width in texture info.

[Vulkan] Don't use power of two for mip width/height calculation for host textures.
[Vulkan] Add more Vulkan error logging.
[Vulkan/GPU] Rudimentary texture dumping.

src/xenia/gpu/texture_info.h

@@ -293,7 +293,8 @@ struct TextureInfo;
 struct TextureExtent {
   uint32_t pitch;          // texel pitch
   uint32_t height;         // texel height
-  uint32_t block_height;   // # of vertical blocks
+  uint32_t block_width;    // # of horizontal visible blocks
+  uint32_t block_height;   // # of vertical visible blocks
   uint32_t block_pitch_h;  // # of horizontal pitch blocks
   uint32_t block_pitch_v;  // # of vertical pitch blocks
   uint32_t depth;