Mega Man X4 Recompiled - v0.1.1-coop-playtest.17

Both players now survive Web Spider's part 1-to-2 transition when P2 leads far ahead.
The outgoing fade could incorrectly kill the hidden P1, leaving only P2 in
the next area. This is fixed; a player who was already dead stays dead.

Local co-op settings are easier to find. In Mods, enabling X + Zero Co-op
now opens its settings panel: boss-door policy, boss scaling, Double and Iris,
Ultimate Armor X Code, and Black Zero. These options work locally and online;
their existing defaults are unchanged.

Windows ZIP and Linux x86_64 AppImage. Both netplay peers must update.
Includes the earlier Playtest 16 fixes. Unified cameras and Stacked lifebars
remain the defaults; Split cameras are experimental. Jet Stingray's reported
P2 entrance presentation remains an open issue.

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.

Keep normal memory-card saves for campaign progress. Use save states made with
this release. Known issues and numbered checklist.