Update and cleanup.

package-lock.json

package.json

src-electron/db/db-api.js

src-electron/generator/static-generator.js

src-electron/importexport/export.js

src-electron/importexport/import.js

src-electron/importexport/mapping.js

src-electron/main-process/args.js

src-electron/main-process/electron-main.js

src-electron/main-process/menu.js

src-electron/main-process/preference.js

src-electron/main-process/tray.js

src-electron/main-process/ui.js

src-electron/main-process/window.js

src-electron/util/env.js