Combine BrowserProxyConfig and BrowserAction.
Add ChromeBrowserApi.

Replaces the Chrome browser config and browser action.
Add FirefoxBrowserApi.
Fixed FirefoxBrowserApi & uistatic.
Deleted old browser interfaces + added comments.
More comments.
Small fixes.

Edited comments.
Deleted Firefox browser action.
Comment.
Fixed typos in Firefox proxy config functions.
Merge pull request #559 from uProxy/lucyhe-support_local_faq

Add support for uProxy local FAQ/info page.