- Use --disable-werror instead of --enable-werror as configure default.
- Fix parsing of 24-bit RGB and 32-bit RGBA bitmaps in WPG2 files.
- Require C++11 for build.
- Fix a couple of issues found by oss-fuzz.
- Improve performance of reading image data from WPG2 files.
- Various minor code cleanups.
Signed-off-by: Pierre-Yves <email@example.com>