Compatibility improvements & bug fixes

[8qwe24657913]

• 遵守WebExtension标准，使用promise而非Chrome的回调 (参考: https://developer.mozilla.org/zh-CN/Add-ons/WebExtensions/Chrome_incompatibilities)
• 兼容Chrome (参考: https://github.com/mozilla/webextension-polyfill ，根据 https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/runtime/onMessage 做了修改)
• 修复background.js与messaging.js中同时使用promise与browser.runtime.lastError的错误 (参考: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/runtime/lastError)
• src/refilter.js与src/storage-websql.js不存在，从manifest.json与popup.html中移除它们