Vcs3D reenable 3D logo

 This branch accomplishes the following:

   * The 3D logo displays for 3D plots and resizes along with window resizes.
   * The logo exception when choosing a colormap is fixed.
   * The multiple logo problem (which used to occur when the 2D and 3D logos were both enabled) is fixed.
   * The 2D logo displays for 2D plots.

This branch does not fix the problem of the 2D logo disappearing when the window resizes- this continues to occur as in the current master.