Update README
Remove legacy app sections from manifest
Bump manifest version
Remove chrome.extension API usage
Remove deprecated APIs usage
Remove misused chrome.tabs & chrome.windows API
Open app UI window via chrome.app.window API
Remove PT Sans (probably forever) as external resource
Use <external-img> to load images outside app
Use webview instead of iframes
Move avatars saving out of backend
Add <img is="avatar-image"> container, which shows images stored inside filesystem / downloads 'em
AccountManager helpers to authorize user
Restore deleted code
Get rid of Accounts- and SettingsManager in front
Update README
Debounce requests token status
Fix contexts mismatch, remove debug log
Remove styled scrollbar
Fix mailSync method, update UI