starcraft replay parser

Read commands part from a StarCraft replay file on stdin (cannot extract
this itself yet), and parses all command blocks. Outputs each player's
apm by default.

Maps ids of commands, build types, units, upgrades, and actions into an
appropriate text. Gives warnings when it encounters something not
recognized.

Most format details were supplied by the document 'Starcraft Replay file
format description' version 0.10 by Soar Chin <webmaster@soarchin.com>.