Removing the asset_helper file (#1868)

- Remove the asset_helper file and call the onInitialize and onDeinitialize functions directly
 - Small compile fix on Windows
 - Removes the need for the registerIdentifierWithMeta function by automatically doing that for all asset.export statements
 - Allow the passing of either identifiers (as before) or entire tables to the removeSceneGraphNode, removeScreenSpaceRenderable, deleteLayer, removeAction, and export methods. In that case, the Identifier key from the table is extracted and used instead

modules/globebrowsing/globebrowsingmodule_lua.inl

@@ -83,8 +83,9 @@ int addLayer(lua_State* L) {
  */
 int deleteLayer(lua_State* L) {
     ghoul::lua::checkArgumentsAndThrow(L, 3, "lua::deleteLayer");
-    auto [globeName, layerGroupName, layerName] =
-        ghoul::lua::values<std::string, std::string, std::string>(L);
+    auto [globeName, layerGroupName, layerOrName] = ghoul::lua::values<
+        std::string, std::string, std::variant<std::string, ghoul::Dictionary>
+    >(L);
 
     // Get the node and make sure it exists
     SceneGraphNode* n = global::renderEngine->scene()->sceneGraphNode(globeName);
@@ -106,6 +107,26 @@ int deleteLayer(lua_State* L) {
         return ghoul::lua::luaError(L, "Unknown layer group: " + layerGroupName);
     }
 
+    std::string layerName;
+    if (std::holds_alternative<std::string>(layerOrName)) {
+        layerName = std::get<std::string>(layerOrName);
+    }
+    else {
+        ghoul_assert(
+            std::holds_alternative<ghoul::Dictionary>(layerOrName),
+            "Missing case"
+        );
+
+        ghoul::Dictionary d = std::get<ghoul::Dictionary>(layerOrName);
+        if (!d.hasValue<std::string>("Identifier")) {
+            return ghoul::lua::luaError(
+                L,
+                "Table passed to deleteLayer does not contain an Identifier"
+            );
+        }
+        layerName = d.value<std::string>("Identifier");
+    }
+
     globe->layerManager().deleteLayer(groupID, layerName);
     return 0;
 }