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This commit moves the non-normative inverse position scaling process
from the codec's reconstruction process into the ply writer.  This
is to support changing the internal point cloud position representation
to integer.

Sehoon Yea authored Sep 25, 2019 and David Flynn committed Nov 21, 2019

In order to support bit depths higher than 8bit, this commit adds
an attr_t type to represent attribute data.  Existing uses of
uint8_t and uint16_t are converted to attr_t.

The GBR coding order matches the description in ISO/IEC 23001-8 for
the identity matrix (MatrixCoefficients=0).

This adoption permits encoding the geometry positions in an order other
than {x,y,z}.  The --geometry_axis_order option causes the encoder to
load data from the ply file in a different order.  The order is
signalled in the SPS and the decoder will label the output axis as
appropriate.

This commit migrates PCCPointSet3::read and write to ply::read and write.