Changes/cleanup to TextureCache::Load and other mipmap related code. The significant change is what is now line 520 of TextureCacheBase.cpp: ((std::max(mipWidth, bsw) * std::max(mipHeight, bsh) * bsdepth) >> 1) to TexDecoder_GetTextureSizeInBytes(expanded_mip_width, expanded_mip_height, texformat); Fixes issue 5328. Fixes issue 5461.