Merge branch 'master' into jgrpp

# Conflicts:
#	CMakeLists.txt
#	cmake/CompileFlags.cmake
#	src/bridge_gui.cpp
#	src/saveload/afterload.cpp
#	src/saveload/saveload.cpp
#	src/saveload/saveload.h
#	src/saveload/town_sl.cpp
#	src/screenshot.cpp
#	src/screenshot.h
#	src/toolbar_gui.cpp
#	src/town.h
#	src/town_cmd.cpp

src/string_func.h

@@ -35,7 +35,7 @@ char *strecpy(char *dst, const char *src, const char *last, bool quiet_mode = fa
 char *stredup(const char *src, const char *last = nullptr);
 
 int CDECL seprintf(char *str, const char *last, const char *format, ...) WARN_FORMAT(3, 4);
-int CDECL vseprintf(char *str, const char *last, const char *format, va_list ap);
+int CDECL vseprintf(char *str, const char *last, const char *format, va_list ap) WARN_FORMAT(3, 0);
 
 char *CDECL str_fmt(const char *str, ...) WARN_FORMAT(1, 2);
 char *str_vfmt(const char *str, va_list ap);