Rename lib/lua folder to lib/luax;

I keep panicking thinking this is the source code for Lua lol

CMakeLists.txt

@@ -593,7 +593,7 @@ else()
 endif()
 
 if(LOVR_ENABLE_UTF8)
-  target_sources(lovr PRIVATE src/lib/lua/lutf8lib.c)
+  target_sources(lovr PRIVATE src/lib/luax/lutf8lib.c)
 else()
   target_compile_definitions(lovr PRIVATE LOVR_DISABLE_UTF8)
 endif()

Tupfile.lua

@@ -387,7 +387,7 @@ for spatializer, enabled in pairs(config.spatializers) do
 end
 
 if config.utf8 then
-  src += 'src/lib/lua/lutf8lib.c'
+  src += 'src/lib/luax/lutf8lib.c'
 else
   cflags += '-DLOVR_DISABLE_UTF8'
 end

src/api/api.c

@@ -1,6 +1,6 @@
 #include "api.h"
 #include "util.h"
-#include "lib/lua/lutf8lib.h"
+#include "lib/luax/lutf8lib.h"
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>