Lua:

* add IO lib (adapted to Rockbox)
 * remove old IO wrappers
 * rework helloworld.lua to work with the IO lib
 * do some stuff in helloworld.lua better (part of FS#10379, by James Callahan)


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21541 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/lua/rocklua.c

@@ -36,6 +36,7 @@ static const luaL_Reg lualibs[] = {
   {LUA_OSLIBNAME,   luaopen_os},
   {LUA_ROCKLIBNAME, luaopen_rock},
   {LUA_BITLIBNAME,  luaopen_bit},
+  {LUA_IOLIBNAME,   luaopen_io},
   {LUA_LOADLIBNAME, luaopen_package},
   {NULL, NULL}
 };