fix : match type for convenience
fix : match type for convenience

DKVertexStreamDeclaration.offset  <->DKVertexAttributeDescriptor
DKVertexBuffer. size <->DKVertexBufferLayoutDescriptor

Hongtae/DKGL,DKGL/DKGL,DKGL/DKGL,tiff2766/DKLib,Hongtae/DKGL,Hongtae/DKGL,Hongtae/DKGL,Hongtae/DKGL,tiff2766/DKLib,Hongtae/DKGL,DKGL/DKGL,DKGL/DKGL,tiff2766/DKLib,DKGL/DKGL,DKGL/DKGL,Hongtae/DKGL,DKGL/DKGL,DKGL/DKGL,tiff2766/DKLib,tiff2766/DKLib,Hongtae/DKGL,tiff2766/DKLib