Tool capable of extracting and packaging tims used for Hogs of War's terrain.

Usage:
                      <input>          <output>
  ptgtool.exe extract maps/creepy2.ptg maps/creepy2/
  ptgtool.exe package maps/creepy2/ maps/creepy2.ptg

When packaging - all tims need to be
of the same format (16 colours, 4 bpp)

Copyright (C) 2019 Mark E Sowden <markelswo@gmail.com>
Originally developed for the OpenHoW project