- [NEW] Ara usa Lua 5.5.0

- [NEW] Lua ara es una llibreria estàtica, pa no compilarlo cada vegada (Linux, falta en Windows)
- [FIX] Arreglats mig kilo de warnings
- [FIX] include <mutex> per a lua.debug

source/external/lua/lua.hpp

@@ -1,9 +1,10 @@
 // lua.hpp
 // Lua header files for C++
-// <<extern "C">> not supplied automatically because Lua also compiles as C++
+// 'extern "C" not supplied automatically in lua.h and other headers
+// because Lua also compiles as C++
 
-//extern "C" {
+extern "C" {
 #include "lua.h"
 #include "lualib.h"
 #include "lauxlib.h"
-//}
+}