Add new Token Branding

[ohager]

Is your feature request related to a problem? Please describe.
We recently introduced custom Token Branding to Signum Swap. This should be added to the XT wallet also

Describe the solution you'd like
Use signumjs SRC44 getAssetBranding implementation to fetch eventually added Token Brands. If not existant use hashicon (remove the identiheart thing as have gfx issues)

Describe alternatives you've considered

Additional context