Import from subversion
Remove subversion's $Id$ from every file
Transition to libzip, stage 1: Remove src/zlib/
Transition to libzip, stage 2: Rewrite zipfile.*
Transition to libzip, stage 3: Use new PAK3Archive
Transition to libzip, stage 4: Rewrite Makefile
Remove obsolete types.h header
Refactor exception.h, rename methods
Clear framebuffer on each frame in main.cc
Remove unused `buttons` variable from main.cc