add on_screen_change project script event & fix UIDocument::rebuildIndices & move menu background to project script

src/logic/scripting/lua/libs/libgui.cpp

@@ -79,9 +79,12 @@ static int l_textbox_paste(lua::State* L) {
 
 static int l_container_add(lua::State* L) {
     auto docnode = get_document_node(L);
+    if (docnode.document == nullptr) {
+        throw std::runtime_error("target document not found");
+    }
     auto node = dynamic_cast<Container*>(docnode.node.get());
     if (node == nullptr) {
-        return 0;
+        throw std::runtime_error("target container not found");
     }
     auto xmlsrc = lua::require_string(L, 2);
     try {
@@ -99,7 +102,7 @@ static int l_container_add(lua::State* L) {
         UINode::getIndices(subnode, docnode.document->getMapWriteable());
         node->add(std::move(subnode));
     } catch (const std::exception& err) {
-        throw std::runtime_error(err.what());
+        throw std::runtime_error("container:add(...): " + std::string(err.what()));
     }
     return 0;
 }

src/logic/scripting/lua/lua_engine.cpp

@@ -58,12 +58,8 @@ static void create_libs(State* L, StateType stateType) {
     openlib(L, "vec4", vec4lib);
     openlib(L, "yaml", yamllib);
 
-    if (stateType == StateType::SCRIPT) {
-        openlib(L, "app", applib);
-    } else if (stateType == StateType::BASE) {
-        openlib(L, "__vc_app", applib);
-    }
     if (stateType == StateType::BASE || stateType == StateType::SCRIPT) {
+        openlib(L, "__vc_app", applib);
         openlib(L, "assets", assetslib);
         openlib(L, "audio", audiolib);
         openlib(L, "console", consolelib);