David Flynn authored Jun 21, 2018 and David Flynn committed Nov 21, 2019

This commit enables the codec to encapsulate more than one frame in the
coded bitstream.  The number of frames to encode is controlled by the
frameCount option.

Support is added to encode multiple source frames from separate ply
files based on a template input file name.  A printf-like "%d" directive
acts as a placeholder for the current frame number.

Decoding functions in a similar way with a each frame decoded from the
bitstream being written to a separate ply file named according to a
template pattern.

The first frame number used for file I/O may be set using the
firstFrameNum option.