Request avatar data if not present
* avatar data reqest will be sent if avatar is not present
* only one metadata handler
* forgot 'static' on some routines
Add avatar_aa_options?
Handle url avatars? (needs common image loading library (sdl-image? imlib?) and web-retrieving library (curl?))
Report no-avatar
Add method to inform other software chunks about avatar change? (external command / custom hook)