added new optional params to packed_scene wrapper

ResourceLoader has some parameters that are otherwise inaccessible, notably the CacheMode, which defaults to 1 = CACHE_MODE_REUSE. 
This caches previous loads and reuses them, which is pretty neat, but the use of this cache may not always be required, so it's best to give the user the option to change this mode.

src/util/scene.hpp

@@ -119,17 +119,21 @@ namespace rl::inline utils
                 using scene_t = TScene;
                 using object_t = TObj;
 
-                /* Pack as preload from path. */
-                packed_scene(godot::String resource_load_path)
+                /** Load and pack from path. */
+                packed_scene(const godot::String& load_resource_path,
+                             const godot::String& load_type_hint = godot::String(),
+                             godot::ResourceLoader::CacheMode load_cache_mode =
+                                 godot::ResourceLoader::CacheMode::CACHE_MODE_REUSE)
                 {
-                    godot::ResourceLoader* resource_loader{ resource::loader::get() };
+                    godot::ResourceLoader* resource_loader{ loader::get() };
 
-                    bool file_access_success{ resource_loader->exists(resource_load_path) };
-                    runtime_assert(file_access_success);
+                    bool resource_exists{ resource_loader->exists(load_resource_path) };
+                    runtime_assert(resource_exists);
 
-                    if (file_access_success)
+                    if (resource_exists)
                     {
-                        m_packed_resource = resource_loader->load(resource_load_path);
+                        m_packed_resource = resource_loader->load(load_resource_path,
+                                                                  load_type_hint, load_cache_mode);
                         initialized = m_packed_resource.is_valid();
                     }
                 }