Start converting module system.

src-electron/db/db-api.js

src-electron/db/query-zcl.js

src-electron/generator/static-generator.js

src-electron/importexport/export.js

src-electron/importexport/import.js

src-electron/main-process/args.js

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

src-electron/rest/generation.js

src-electron/rest/user-data.js

src-electron/server/http-server.js

src-electron/util/env.js

src-electron/util/util.js

src-electron/zcl/zcl-loader.js

test/env.test.js