Implement Shareable Dash URL

[jojobyte]

• as described in URL & URI Compatibility
• with https://wallet.dashincubator.dev as the base url

https://wallet.dashincubator.dev/contact/pair
    ?coin=dash
    #?xpub=xpub6FKUF6P1ULrfvSrhA9DKSS3MA3digsd27MSTMjBxCczsfYz7vcFLnbQwjP9CsAfEJsnD4UwtbU43iZaibv4vnzQNZmQAVcufN4r3pva8kTz
    &preferred_username=john.doe
    &name=John

[riongull]

We should probably have coin be something more specific, like slip39_coin_number and maybe have a coin_name as well depending on the purpose of these items.