Khaled Mammou authored Mar 25, 2018 and David Flynn committed Jun 05, 2018

This commit reorganises the attribute coders to allow integration
of the RAHT variant.

In order to support multiple different attribute compression schemes,
this commit moves the existing attribute compression code into a
self-contained class.

In order to support multiple different attribute compression schemes,
this commit moves the existing attribute compression code into a
self-contained class.

This commit changes the application's reporting of elapsed time to
measure user time rather than wall time in order to reduce sources
of noise in evaluating runtime.

For output is now of the form:

  ```
  Processing time (wall): 123.456 s
  Processing time (user): 123.456 s
  ```



git-svn-id: http://wg11.sc29.org/svn/repos/MPEG-I/Part5-PointCloudCompression/TM/TMC3/trunk@1329 94298a81-5874-47c9-aab8-bfb24faeed7f

This commit replaces the previous command-line argument parsing with
program-options-lite, which additionally serves as a simple config-file
parser.

A table based configuration of options provides in a single place
option naming, help text, and default values.

Side effects of this change are to:

 - adds further error checking for unknown arguments (warning only), parse
   failures, required options.

 - replace the default constructor of Parameters,
   PCCAttributeEncodeParamaters, and PCCAttributeEncodeParamaters
   with defaults in args handler

 - updates the type of Parameters::mode & ...::colorTransform to be more
   more descriptive.



git-svn-id: http://wg11.sc29.org/svn/repos/MPEG-I/Part5-PointCloudCompression/TM/TMC3/trunk@1318 94298a81-5874-47c9-aab8-bfb24faeed7f

git-svn-id: http://wg11.sc29.org/svn/repos/MPEG-I/Part5-PointCloudCompression/TM/TMC3/trunk@1262 94298a81-5874-47c9-aab8-bfb24faeed7f

git-svn-id: http://wg11.sc29.org/svn/repos/MPEG-I/Part5-PointCloudCompression/TM/TMC3/trunk@1231 94298a81-5874-47c9-aab8-bfb24faeed7f

git-svn-id: http://wg11.sc29.org/svn/repos/MPEG-I/Part5-PointCloudCompression/TM/TMC3/trunk@1223 94298a81-5874-47c9-aab8-bfb24faeed7f

git-svn-id: http://wg11.sc29.org/svn/repos/MPEG-I/Part5-PointCloudCompression/TM/TMC3/trunk@1221 94298a81-5874-47c9-aab8-bfb24faeed7f