pokutuna

- improve type guard - improve it at using JSON schema - improve it at communicating with chrome.storage

Issues - How can we feedback error? - Update function list in context menu? Is is possible to update in real time? - `content` is always empty, is that okay?

Support English & Japanese

 I guess this may happens when newline and whitespace are on line head. chrome-extension://ihnfodlbkhgjnbheemjhkjfkfglgbdgc/options.html#/install?f=eyJuYW1lIjoiU2NyYXBib3g6IEdpdEh1YiB1c2VyL3JlcG9AcmV2IC0gZmlsZSNsaW5lIiwiY29kZSI6Ii8qKlxuICogUmV0dXJuIHZhbHVlIHdpbGwgYmUgY29waWVkIHRvIGNsaXBib2FyZC5cbiAqIEBwYXJhbSB7T2JqZWN0fSBwYWdlXG4gKiBAcmV0dXJucyB7KHN0cmluZ3x1bmRlZmluZWR8UHJvbWlzZSl9XG4gKi9cbih7dGl0bGUsIHVybCwgY29udGVudCwgc2VsZWN0aW5nVGV4dH0pID0%2BIHtcbiAgY29uc3QgcGF0dGVybiA9IC9odHRwcz86XFwvXFwvKC4rKVxcLyg%2FPHVzZXI%2BLispXFwvKD88cmVwbz4uKylcXC9ibG9iXFwvKD88cmV2PlswLTlhLWZdKylcXC8oPzxmaWxlPlteI10rKSg%2FPGhhc2g%2BIy4rKT8vO1xuICBjb25zdCBnID0gcGF0dGVybi5leGVjKHVybCkuZ3JvdXBzO1xuICByZXR1cm4gYFske2cudXNlcn0vJHtnLnJlcG99QCR7Zy5yZXYuc3Vic3RyKDAsNyl9IC0gJHtnLmZpbGV9JHtnLmhhc2ggfHwgJyd9ICR7dXJsfV1gXG59IiwicGF0dGVybiI6Imh0dHBzPzovLy4rLy4rLy4rL2Jsb2IvLisvIiwidGhlbWUiOnsidGV4dENvbG9yIjoiI0ZGRkZGRiIsImJhY2tncm91bmRDb2xvciI6IiM2MDdEOEIifSwidmVyc2lvbiI6MX0%3D

- [Safari Web Extensions | Apple Developer Documentation](https://developer.apple.com/documentation/safariservices/safari_web_extensions) - [manifest.json - Mozilla | MDN](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json) - change manifest.json for Chrome to be as common WebExtensions