Mega Man X4 Recompiled - v0.1.1-coop-playtest.18

Smoother co-op progression, independent cameras, and boss fights.

• Walk through boss doors together. With Both players selected, both
  living, present players can move and attack through the open door without
  the partner teleporting out and back in.
• Opening stage: destroying the breakable miniboss door correctly releases
  Player 2's independent camera.
• Web Spider: Player 2's scenery updates correctly in part 2 instead of
  disappearing or freezing as the players separate.
• Sigma stage 1: enemies spawn when Player 2 advances ahead of Player 1.
• Colonel: lightning no longer leaves the screen white after Player 1 dies.
• Double: Zero's attacks with native damage values now hurt him during
  his normal vulnerable phases.

Windows ZIP and Linux x86_64 AppImage. Both netplay peers must update.
Unified cameras and Stacked lifebars remain the defaults; Split cameras remain
experimental. Existing gameplay option defaults are unchanged.

Save compatibility: normal campaign memory-card saves carry forward.
Older co-op save states are incompatible; create new states with Playtest 18.

Diagnostics default on in fresh installs. Keep Input Display and Recording
enabled and look for REC. After reproducing a bug, quit normally and zip the
complete saves/diagnostics folder beside the executable or AppImage.

Jet Stingray's reported P2 entrance presentation remains open.
Known issues and numbered checklist.