Merge branch 'master' into jgrpp

# Conflicts:
#	.github/workflows/ci-build.yml
#	.github/workflows/release.yml
#	CMakeLists.txt
#	os/macosx/Info.plist.in
#	src/fileio.cpp
#	src/landscape.cpp
#	src/league_cmd.h
#	src/saveload/ai_sl.cpp
#	src/saveload/game_sl.cpp
#	src/saveload/league_sl.cpp
#	src/saveload/saveload.cpp

src/ai/ai_instance.cpp

@@ -60,6 +60,9 @@ void AIInstance::Died()
 {
 	ScriptInstance::Died();
 
+	/* Intro is not supposed to use AI, but it may have 'dummy' AI which instant dies. */
+	if (_game_mode == GM_MENU) return;
+
 	ShowAIDebugWindow(_current_company);
 
 	const AIInfo *info = AIConfig::GetConfig(_current_company, AIConfig::SSS_FORCE_GAME)->GetInfo();