0.99.403b

• Fix mouse sensitivity being wrong in the horizontal direction in widescreen mode.
• Fix bug occasionally causing visual corruption when many things were on screen.
• Fix the well-known issue of the '5' character looking like a '6'. (Shouldn't interfere with other mods.)
• Fix "tearing" seen due to vsync being disabled. Re-enable vsync by default (use -dxnovsync to disable it).
• Some small performance improvements.
• Updated: include relevant license texts.