Mega Man X4 Widescreen

This default-disabled mod enables X4's game-specific 16:9 rendering path. Its
background, actor-culling, and HUD hooks remain inert at native 4:3 and are
activated through the stable mmx4.widescreen plugin id. The implementation is
validated for 16:9; ultrawide is not offered.

Credit

mstan - widescreen implementation and mod integration
