lua: remove LuaLoader::Find() helper

This has proved unreliable because coroutines create whole new environments,
so one of the only ways to store user data and access it even from coroutines
is to use lua_setglobal().

src/lolua/baselua.cpp

@@ -133,15 +133,6 @@ void Loader::Release(LuaState* l, Lolua::Loader* loader)
     }
 }
 
-Lolua::Loader *LuaLoader::Find(LuaState* l)
-{
-    for (int i = 0; i < g_loaders.count(); ++i)
-        if (g_loaders[i].m1 == l)
-            return g_loaders[i].m2;
-
-    return nullptr;
-}
-
 //Store lua object --------------------------------------------------------
 void Loader::StoreObject(LuaState* l, Object* obj)
 {

src/lolua/baselua.h

@@ -995,7 +995,6 @@ public:
 protected:
     LuaState* GetLuaState();
     static void Store(LuaState* l, Loader* loader);
-    static Loader *Find(LuaState* l);
     static void Release(LuaState* l, Loader* loader);
     static void StoreObject(LuaState* l, Object* obj);
     //Virtual Store lua object ------------------------------------------------