Server part: Implement Volume responses

Signed-off-by: Frca <killerfrca@gmail.com>
Server part: Fix serverControl initialization

Signed-off-by: Frca <killerfrca@gmail.com>
Android part: Implement client side Volume request/response handling

Signed-off-by: Frca <killerfrca@gmail.com>
Android part: Fix torrent icon size

Signed-off-by: Frca <killerfrca@gmail.com>
Android part: A little code cleanup

Signed-off-by: Frca <killerfrca@gmail.com>
Server part: Update server binary

Signed-off-by: Frca <killerfrca@gmail.com>