Update the software documentation/manual for VTM/JVET

Merged Karsten Suehring requested to merge ksuehring/VVCSoftware_VTM:docs-cleanup into master
  • change README.txt to markdown (displays in GitLab)
  • update build instructions
  • update LaTEX document template for JVET and include it
  • general updates for the software manual (authors, purpose, etc.)
  • update build instructions (aligned with README)
  • use code highlighting (requires Pygments installation)
  • minor formatting updates
  • update copyright date in COPYING file
Edited by Karsten Suehring

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