[nostalgia,studio] Update for Ox changes, cleanup

src/studio/applib/src/studioapp.cpp

@@ -349,7 +349,7 @@ ox::Error StudioUI::openFileActiveTab(ox::CRStringView path, bool makeActiveTab)
 	m_editors.emplace_back(editor);
 	m_openFiles.emplace_back(path);
 	if (makeActiveTab) {
-		m_activeEditor = m_editors.back().value.get();
+		m_activeEditor = m_editors.back().value->get();
 		m_activeEditorUpdatePending = editor;
 	}
 	// save to config

src/studio/modlib/include/studio/configio.hpp

@@ -49,7 +49,7 @@ ox::Error writeConfig(keel::Context *ctx, ox::CRStringView name, T *data) noexce
 		return err;
 	}
 	oxRequireM(buff, ox::writeOC(*data));
-	buff.back().value = '\n';
+	*buff.back().value = '\n';
 	if (const auto err = fs.write(path, buff.data(), buff.size())) {
 		oxErrf("Could not read config file: {}\n", toStr(err));
 		return OxError(2, "Could not read config file");

src/studio/modlib/include/studio/project.hpp

@@ -120,7 +120,7 @@ ox::Error Project::writeObj(const ox::StringView &path, const T *obj, ox::ClawFo
 	for (const auto &t : m_typeStore.typeList()) {
 		oxRequireM(typeOut, ox::writeClaw(*t, ox::ClawFormat::Organic));
 		// replace garbage last character with new line
-		typeOut.back().value = '\n';
+		*typeOut.back().value = '\n';
 		// write to FS
 		const auto typePath = ox::sfmt("/{}/{}", descPath, buildTypeId(*t));
 		oxReturnError(writeBuff(typePath, typeOut));

src/studio/modlib/src/undostack.cpp

@@ -17,7 +17,7 @@ void UndoStack::push(UndoCommand *cmd) noexcept {
 	cmd->redo();
 	redoTriggered.emit(cmd);
 	changeTriggered.emit(cmd);
-	if (!m_stack.size() || !m_stack.back().value->mergeWith(cmd)) {
+	if (!m_stack.size() || !(*m_stack.back().value)->mergeWith(cmd)) {
 		m_stack.emplace_back(cmd);
 		++m_stackIdx;
 	} else {