Wrong logo and unsupported address formats about DigiByte

Agama wallet has old DigiByte logo that is no longer used. Here is the new logo: https://raw.githubusercontent.com/DigiByte-Core/digibyte-logos/master/Logos%20Bitmap/transparent%20bg/ClearBg%20DigiByte.png

In addition, the wallet does not support sending to "S" prefixed p2sh multisig/segwit and "dgb1" prefixed bech32 native segwit DigiByte addresses. These addresses are widely used. All non segwit DGB nodes have been left behind with the Odocrypt hard fork, therefore there is no reason not to support them.